diff --git a/pkgs/development/compilers/gcc/12/default.nix b/pkgs/development/compilers/gcc/12/default.nix
index 4f2da6903d3..fb76b039fb0 100644
--- a/pkgs/development/compilers/gcc/12/default.nix
+++ b/pkgs/development/compilers/gcc/12/default.nix
@@ -109,7 +109,7 @@ stdenv.mkDerivation ({
   # This should kill all the stdinc frameworks that gcc and friends like to
   # insert into default search paths.
   + lib.optionalString hostPlatform.isDarwin ''
-    substituteInPlace gcc/config/darwin-c.c \
+    substituteInPlace gcc/config/darwin-c.cc \
       --replace 'if (stdinc)' 'if (0)'
 
     substituteInPlace libgcc/config/t-slibgcc-darwin \