diff --git a/arch/um/include/user.h b/arch/um/include/user.h
index a6da62608254..d380e6d91a90 100644
--- a/arch/um/include/user.h
+++ b/arch/um/include/user.h
@@ -14,6 +14,11 @@
  */
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
+/*
+ * This will provide the size_t definition in both kernel and userspace builds
+ */
+#include <linux/types.h>
+
 extern void panic(const char *fmt, ...)
 	__attribute__ ((format (printf, 1, 2)));
 extern int printk(const char *fmt, ...)
@@ -21,8 +26,7 @@ extern int printk(const char *fmt, ...)
 extern void schedule(void);
 extern int in_aton(char *str);
 extern int open_gdb_chan(void);
-/* These use size_t, however unsigned long is correct on both i386 and x86_64. */
-extern unsigned long strlcpy(char *, const char *, unsigned long);
-extern unsigned long strlcat(char *, const char *, unsigned long);
+extern size_t strlcpy(char *, const char *, size_t);
+extern size_t strlcat(char *, const char *, size_t);
 
 #endif