diff --git a/include/grp.h b/include/grp.h
index abd88ef18153..07a4e454f2ec 100644
--- a/include/grp.h
+++ b/include/grp.h
@@ -42,13 +42,17 @@
 #ifndef _GRP_H_
 #define	_GRP_H_
 
-#include <sys/types.h>
 #include <sys/cdefs.h>
 
 #ifndef _POSIX_SOURCE
 #define	_PATH_GROUP		"/etc/group"
 #endif
 
+#ifndef _GID_T_DECLARED
+#define	_GID_T_DECLARED
+typedef	u_int32_t	gid_t;
+#endif
+
 struct group {
 	char	*gr_name;		/* group name */
 	char	*gr_passwd;		/* group password */
diff --git a/sys/sys/types.h b/sys/sys/types.h
index e80462baa948..db3c04d78ba2 100644
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -73,7 +73,12 @@ typedef	__volatile char *v_caddr_t;	/* core address, pointer to volatile */
 typedef	int32_t		daddr_t;	/* disk address */
 typedef	u_int32_t	u_daddr_t;	/* unsigned disk address */
 typedef	u_int32_t	fixpt_t;	/* fixed point number */
+
+#ifndef _GID_T_DECLARED
+#define	_GID_T_DECLARED
 typedef	u_int32_t	gid_t;		/* group id */
+#endif
+
 typedef	u_int32_t	ino_t;		/* inode number */
 typedef	long		key_t;		/* IPC key (for Sys V IPC) */
 typedef	u_int16_t	mode_t;		/* permissions */