diff --git a/src/lsp/ffi.lsp b/src/lsp/ffi.lsp
index e3a7e1473..9aee273d8 100644
--- a/src/lsp/ffi.lsp
+++ b/src/lsp/ffi.lsp
@@ -607,6 +607,8 @@
 
 (defmacro load-foreign-library (filename &key module supporting-libraries force-load)
   (declare (ignore module force-load supporting-libraries))
+  (unless (constantp filename)
+    (error "~&LOAD-FOREIGN-LIBRARY: ~A is not a constant expression. This is currently not supported." filename))
   `(eval-when (:compile-toplevel)
      (do-load-foreign-library ,filename)))