diff --git a/src/config.h.cmake b/src/config.h.cmake
index 1bd1eeb3..5e44dc9b 100644
--- a/src/config.h.cmake
+++ b/src/config.h.cmake
@@ -259,9 +259,6 @@
 /* The size of `wchar_t', as computed by sizeof. */
 @SIZEOF_WCHAR_T_CODE@
 
-/* Define to 1 if you have the ANSI C header files. */
-#cmakedefine01 STDC_HEADERS
-
 /* Set to long if unknown. */
 #define TYPEOF_SF_COUNT_T @TYPEOF_SF_COUNT_T@