diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 98ad170b10e0..cf12ba86205c 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1727,7 +1727,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 
 	/* Reject out-of-range values early.  Large positive sizes are
 	   used for unknown buffer sizes. */
-	if (WARN_ON_ONCE((int) size < 0))
+	if (WARN_ON_ONCE(size > INT_MAX))
 		return 0;
 
 	str = buf;