diff --git a/lisp/ldefs-boot.el b/lisp/ldefs-boot.el
index 71b107e071c..5948b6a67e4 100644
--- a/lisp/ldefs-boot.el
+++ b/lisp/ldefs-boot.el
@@ -5039,7 +5039,7 @@ Normally display output in temp buffer, but
 prefix arg means replace the region with it.
 
 `c-macro-preprocessor' specifies the preprocessor to use.
-Tf the user option `c-macro-prompt-flag' is non-nil
+If the user option `c-macro-prompt-flag' is non-nil
 prompt for arguments to the preprocessor (e.g. `-DDEBUG -I ./include'),
 otherwise use `c-macro-cppflags'.