diff --git a/src/util/os.c b/src/util/os.c
index c2f947920..5a7220e7d 100644
--- a/src/util/os.c
+++ b/src/util/os.c
@@ -3,6 +3,7 @@
 #if defined(WIN32)
 #include <direct.h>
 #else   /* WIN32 */
+#include <sys/types.h>
 #include <sys/stat.h>
 #endif  /* WIN32 */
 int os_mkdir(const char *path, int mode)