diff --git a/tests/libtest/lib505.c b/tests/libtest/lib505.c
index 10aa1ab194..c398d39f24 100644
--- a/tests/libtest/lib505.c
+++ b/tests/libtest/lib505.c
@@ -13,7 +13,7 @@
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
-#ifdef HAVE_SYS_TYPES_
+#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_STAT_H