diff --git a/lisp/progmodes/cmake-ts-mode.el b/lisp/progmodes/cmake-ts-mode.el
index 854adf4ade7..597ef69d9b8 100644
--- a/lisp/progmodes/cmake-ts-mode.el
+++ b/lisp/progmodes/cmake-ts-mode.el
@@ -208,7 +208,7 @@ Return nil if there is no name or if NODE is not a defun node."
   :syntax-table cmake-ts-mode--syntax-table
 
   (when (treesit-ready-p 'cmake)
-    (treesit-parser-create 'cmake)
+    (setq treesit-primary-parser (treesit-parser-create 'cmake))
 
     ;; Comments.
     (setq-local comment-start "# ")
diff --git a/lisp/progmodes/csharp-mode.el b/lisp/progmodes/csharp-mode.el
index 1f86527191a..b86555b1d87 100644
--- a/lisp/progmodes/csharp-mode.el
+++ b/lisp/progmodes/csharp-mode.el
@@ -1049,7 +1049,7 @@ Key bindings:
     (error "Tree-sitter for C# isn't available"))
 
   ;; Tree-sitter.
-  (treesit-parser-create 'c-sharp)
+  (setq treesit-primary-parser (treesit-parser-create 'c-sharp))
 
   ;; Comments.
   (c-ts-common-comment-setup)
diff --git a/lisp/progmodes/dockerfile-ts-mode.el b/lisp/progmodes/dockerfile-ts-mode.el
index e31fd86bbdf..42fa7482a87 100644
--- a/lisp/progmodes/dockerfile-ts-mode.el
+++ b/lisp/progmodes/dockerfile-ts-mode.el
@@ -133,7 +133,7 @@ Return nil if there is no name or if NODE is not a stage node."
   :syntax-table dockerfile-ts-mode--syntax-table
 
   (when (treesit-ready-p 'dockerfile)
-    (treesit-parser-create 'dockerfile)
+    (setq treesit-primary-parser (treesit-parser-create 'dockerfile))
 
     ;; Comments.
     (setq-local comment-start "# ")
diff --git a/lisp/progmodes/go-ts-mode.el b/lisp/progmodes/go-ts-mode.el
index cb9a58e33b5..6fa8049e5e7 100644
--- a/lisp/progmodes/go-ts-mode.el
+++ b/lisp/progmodes/go-ts-mode.el
@@ -262,7 +262,7 @@
   :syntax-table go-ts-mode--syntax-table
 
   (when (treesit-ready-p 'go)
-    (treesit-parser-create 'go)
+    (setq treesit-primary-parser (treesit-parser-create 'go))
 
     ;; Comments.
     (setq-local comment-start "// ")
@@ -539,7 +539,7 @@ what the parent of the node would be if it were a node."
   :syntax-table go-mod-ts-mode--syntax-table
 
   (when (treesit-ready-p 'gomod)
-    (treesit-parser-create 'gomod)
+    (setq treesit-primary-parser (treesit-parser-create 'gomod))
 
     ;; Comments.
     (setq-local comment-start "// ")
diff --git a/lisp/progmodes/heex-ts-mode.el b/lisp/progmodes/heex-ts-mode.el
index b527d96b579..84fd513525c 100644
--- a/lisp/progmodes/heex-ts-mode.el
+++ b/lisp/progmodes/heex-ts-mode.el
@@ -148,7 +148,7 @@ With ARG, do it many times.  Negative ARG means move backward."
   :group 'heex-ts
 
   (when (treesit-ready-p 'heex)
-    (treesit-parser-create 'heex)
+    (setq treesit-primary-parser (treesit-parser-create 'heex))
 
     ;; Comments
     (setq-local treesit-thing-settings
diff --git a/lisp/progmodes/json-ts-mode.el b/lisp/progmodes/json-ts-mode.el
index 1fb96555010..7409c6be833 100644
--- a/lisp/progmodes/json-ts-mode.el
+++ b/lisp/progmodes/json-ts-mode.el
@@ -128,7 +128,7 @@ Return nil if there is no name or if NODE is not a defun node."
   (unless (treesit-ready-p 'json)
     (error "Tree-sitter for JSON isn't available"))
 
-  (treesit-parser-create 'json)
+  (setq treesit-primary-parser (treesit-parser-create 'json))
 
   ;; Comments.
   (setq-local comment-start "// ")
diff --git a/lisp/progmodes/lua-ts-mode.el b/lisp/progmodes/lua-ts-mode.el
index a1dae0628d4..20bc1f3e158 100644
--- a/lisp/progmodes/lua-ts-mode.el
+++ b/lisp/progmodes/lua-ts-mode.el
@@ -750,7 +750,7 @@ Calls REPORT-FN directly."
   (use-local-map lua-ts-mode-map)
 
   (when (treesit-ready-p 'lua)
-    (treesit-parser-create 'lua)
+    (setq treesit-primary-parser (treesit-parser-create 'lua))
 
     ;; Comments.
     (setq-local comment-start "--")
diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index a75317b3b0e..6d57517cd25 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -7182,7 +7182,7 @@ implementations: `python-mode' and `python-ts-mode'."
 \\{python-ts-mode-map}"
   :syntax-table python-mode-syntax-table
   (when (treesit-ready-p 'python)
-    (treesit-parser-create 'python)
+    (setq treesit-primary-parser (treesit-parser-create 'python))
     (setq-local treesit-font-lock-feature-list
                 '(( comment definition)
                   ( keyword string type)
diff --git a/lisp/progmodes/ruby-ts-mode.el b/lisp/progmodes/ruby-ts-mode.el
index adcdf15c7ad..aff0b8911b9 100644
--- a/lisp/progmodes/ruby-ts-mode.el
+++ b/lisp/progmodes/ruby-ts-mode.el
@@ -1127,7 +1127,7 @@ leading double colon is not added."
   (unless (treesit-ready-p 'ruby)
     (error "Tree-sitter for Ruby isn't available"))
 
-  (treesit-parser-create 'ruby)
+  (setq treesit-primary-parser (treesit-parser-create 'ruby))
 
   (setq-local add-log-current-defun-function #'ruby-ts-add-log-current-function)
 
diff --git a/lisp/progmodes/rust-ts-mode.el b/lisp/progmodes/rust-ts-mode.el
index b7a52b06b24..e52ea3b125a 100644
--- a/lisp/progmodes/rust-ts-mode.el
+++ b/lisp/progmodes/rust-ts-mode.el
@@ -511,7 +511,7 @@ See `prettify-symbols-compose-predicate'."
   :syntax-table rust-ts-mode--syntax-table
 
   (when (treesit-ready-p 'rust)
-    (treesit-parser-create 'rust)
+    (setq treesit-primary-parser (treesit-parser-create 'rust))
 
     ;; Syntax.
     (setq-local syntax-propertize-function
diff --git a/lisp/progmodes/sh-script.el b/lisp/progmodes/sh-script.el
index a348e9ba6fd..8ba64100203 100644
--- a/lisp/progmodes/sh-script.el
+++ b/lisp/progmodes/sh-script.el
@@ -1623,7 +1623,7 @@ not written in Bash or sh."
     (add-hook 'flymake-diagnostic-functions #'sh-shellcheck-flymake nil t)
     (add-hook 'hack-local-variables-hook
               #'sh-after-hack-local-variables nil t)
-    (treesit-parser-create 'bash)
+    (setq treesit-primary-parser (treesit-parser-create 'bash))
     (setq-local treesit-font-lock-feature-list
                 '(( comment function)
                   ( command declaration-command keyword string)
diff --git a/lisp/progmodes/typescript-ts-mode.el b/lisp/progmodes/typescript-ts-mode.el
index b1288f17d86..ef5dbe51ada 100644
--- a/lisp/progmodes/typescript-ts-mode.el
+++ b/lisp/progmodes/typescript-ts-mode.el
@@ -515,7 +515,7 @@ This mode is intended to be inherited by concrete major modes."
   :syntax-table typescript-ts-mode--syntax-table
 
   (when (treesit-ready-p 'typescript)
-    (treesit-parser-create 'typescript)
+    (setq treesit-primary-parser (treesit-parser-create 'typescript))
 
     ;; Indent.
     (setq-local treesit-simple-indent-rules
@@ -553,7 +553,7 @@ at least 3 (which is the default value)."
   :syntax-table typescript-ts-mode--syntax-table
 
   (when (treesit-ready-p 'tsx)
-    (treesit-parser-create 'tsx)
+    (setq treesit-primary-parser (treesit-parser-create 'tsx))
 
     ;; Comments.
     (setq-local comment-start "// ")
diff --git a/lisp/textmodes/css-mode.el b/lisp/textmodes/css-mode.el
index f5a20e0ca0e..c8da28187ee 100644
--- a/lisp/textmodes/css-mode.el
+++ b/lisp/textmodes/css-mode.el
@@ -1814,7 +1814,7 @@ can also be used to fill comments.
     (setq-local font-lock-fontify-region-function #'css--fontify-region)
 
     ;; Tree-sitter specific setup.
-    (treesit-parser-create 'css)
+    (setq treesit-primary-parser (treesit-parser-create 'css))
     (setq-local treesit-simple-indent-rules css--treesit-indent-rules)
     (setq-local treesit-defun-type-regexp "rule_set")
     (setq-local treesit-defun-name-function #'css--treesit-defun-name)
diff --git a/lisp/textmodes/html-ts-mode.el b/lisp/textmodes/html-ts-mode.el
index 235e1055fa9..f78fbdde1da 100644
--- a/lisp/textmodes/html-ts-mode.el
+++ b/lisp/textmodes/html-ts-mode.el
@@ -92,7 +92,7 @@ Return nil if there is no name or if NODE is not a defun node."
   (unless (treesit-ready-p 'html)
     (error "Tree-sitter for HTML isn't available"))
 
-  (treesit-parser-create 'html)
+  (setq treesit-primary-parser (treesit-parser-create 'html))
 
   ;; Indent.
   (setq-local treesit-simple-indent-rules html-ts-mode--indent-rules)
diff --git a/lisp/textmodes/toml-ts-mode.el b/lisp/textmodes/toml-ts-mode.el
index 3c4533a7fea..806f045c23b 100644
--- a/lisp/textmodes/toml-ts-mode.el
+++ b/lisp/textmodes/toml-ts-mode.el
@@ -124,7 +124,7 @@ Return nil if there is no name or if NODE is not a defun node."
   :syntax-table toml-ts-mode--syntax-table
 
   (when (treesit-ready-p 'toml)
-    (treesit-parser-create 'toml)
+    (setq treesit-primary-parser (treesit-parser-create 'toml))
 
     ;; Comments
     (setq-local comment-start "# ")
diff --git a/lisp/textmodes/yaml-ts-mode.el b/lisp/textmodes/yaml-ts-mode.el
index 210835585fe..42d7c2e1798 100644
--- a/lisp/textmodes/yaml-ts-mode.el
+++ b/lisp/textmodes/yaml-ts-mode.el
@@ -148,7 +148,7 @@ boundaries.  JUSTIFY is passed to `fill-paragraph'."
   :syntax-table yaml-ts-mode--syntax-table
 
   (when (treesit-ready-p 'yaml)
-    (treesit-parser-create 'yaml)
+    (setq treesit-primary-parser (treesit-parser-create 'yaml))
 
     ;; Comments.
     (setq-local comment-start "# ")