diff --git a/lib/stpecpy.h b/lib/stpecpy.h
index e2c2f479..766793ba 100644
--- a/lib/stpecpy.h
+++ b/lib/stpecpy.h
@@ -17,7 +17,7 @@
 #include <stddef.h>
 #include <string.h>
 
-#include "defines.h"
+#include "mempcpy.h"
 
 
 inline char *stpecpy(char *dst, char *end, const char *restrict src);