diff --git a/arch/mn10300/include/asm/posix_types.h b/arch/mn10300/include/asm/posix_types.h
index 077567c37798..56ffbc158798 100644
--- a/arch/mn10300/include/asm/posix_types.h
+++ b/arch/mn10300/include/asm/posix_types.h
@@ -25,8 +25,13 @@ typedef int		__kernel_pid_t;
 typedef unsigned short	__kernel_ipc_pid_t;
 typedef unsigned short	__kernel_uid_t;
 typedef unsigned short	__kernel_gid_t;
+#if __GNUC__ == 4
+typedef unsigned int	__kernel_size_t;
+typedef signed int	__kernel_ssize_t;
+#else
 typedef unsigned long	__kernel_size_t;
-typedef long		__kernel_ssize_t;
+typedef signed long	__kernel_ssize_t;
+#endif
 typedef int		__kernel_ptrdiff_t;
 typedef long		__kernel_time_t;
 typedef long		__kernel_suseconds_t;