diff --git a/reactos/lib/sdk/crt/stdio/lnx_sprintf.c b/reactos/lib/sdk/crt/stdio/lnx_sprintf.c
index 11981ddf439..7f12c7933a8 100644
--- a/reactos/lib/sdk/crt/stdio/lnx_sprintf.c
+++ b/reactos/lib/sdk/crt/stdio/lnx_sprintf.c
@@ -544,7 +544,7 @@ int __cdecl lnx_vsnprintf(char *buf, size_t cnt, const char *fmt, va_list args)
 				flags |= ZEROPAD;
 			}
 			str = number(str, end,
-				(unsigned long) va_arg(args, void *), 16,
+				(uintptr_t) va_arg(args, void *), 16,
 				field_width, precision, flags);
 			continue;