diff --git a/include/lib/libc/stdint.h b/include/lib/libc/stdint.h
index 80b3e96..818870e 100644
--- a/include/lib/libc/stdint.h
+++ b/include/lib/libc/stdint.h
@@ -72,7 +72,7 @@
 #define PTRDIFF_MIN LONG_MIN
 #define PTRDIFF_MAX LONG_MAX
 
-#define SIZE_MAX UINT64_MAX
+#define SIZE_MAX ULONG_MAX
 
 #define INT8_C(x)  x
 #define INT16_C(x) x