diff --git a/test/regress_ssl.c b/test/regress_ssl.c
index e16bf8b3..6bc5f320 100644
--- a/test/regress_ssl.c
+++ b/test/regress_ssl.c
@@ -30,6 +30,7 @@
 #endif
 
 #ifndef WIN32
+#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #endif