diff --git a/src/libspf2/spf_utils.c b/src/libspf2/spf_utils.c
index 54878fa..49188dc 100644
--- a/src/libspf2/spf_utils.c
+++ b/src/libspf2/spf_utils.c
@@ -25,6 +25,8 @@
 #include <memory.h>
 #endif
 
+#include <string.h>
+
 
 
 #include "spf.h"