--- a/compat.c
+++ b/compat.c
@@ -51,6 +51,7 @@ int snprintf(char *str, size_t size, con
 
 #ifndef HAVE_STRNSTR
 #include <string.h>
+#include <sys/types.h>
 /* FUNCTION PROGRAMER: Siberiaic Sang */
 char *strnstr(const char *haystack, const char *needle, size_t haystacklen)
 {