diff --git a/Userland/Libraries/LibC/limits.h b/Userland/Libraries/LibC/limits.h
index b1d990ba3b..b873b4cf3e 100644
--- a/Userland/Libraries/LibC/limits.h
+++ b/Userland/Libraries/LibC/limits.h
@@ -56,8 +56,8 @@
 #define INT_WIDTH 32
 #define UINT_WIDTH 32
 
-#define LONG_WIDTH 32
-#define ULONG_WIDTH 32
+#define LONG_WIDTH 64
+#define ULONG_WIDTH 64
 
 #define LLONG_WIDTH 64
 #define ULLONG_WIDTH 64