diff --git a/config.h.cmake b/config.h.cmake
index a675bad..caff6e3 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -23,6 +23,7 @@
 # ifdef __cplusplus
   }
 #  endif
+#define HAVE_STRLCAT
 #endif
 
 // NOTE: some macros already defined in python.h so if they