diff --git a/include/libwebsockets.h b/include/libwebsockets.h
index c980036b9..007e5b4cd 100644
--- a/include/libwebsockets.h
+++ b/include/libwebsockets.h
@@ -102,8 +102,8 @@ typedef unsigned long long lws_intptr_t;
 #define O_RDONLY	_O_RDONLY
 #endif
 
-typedef int uid_t;
-typedef int gid_t;
+typedef unsigned int uid_t;
+typedef unsigned int gid_t;
 typedef unsigned short sa_family_t;
 #if !defined(LWS_HAVE_SUSECONDS_T)
 typedef unsigned int useconds_t;