diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4bad5700670ae7212ec18b5efaf936ed91e39895..40b0627aeb5e57731892c3c2b470f9da95888644 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3265,6 +3265,12 @@ sub process {
 			     "sizeof(& should be avoided\n" . $herecurr);
 		}
 
+# check for sizeof without parenthesis
+		if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
+			WARN("SIZEOF_PARENTHESIS",
+			     "sizeof $1 should be sizeof($1)\n" . $herecurr);
+		}
+
 # check for line continuations in quoted strings with odd counts of "
 		if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
 			WARN("LINE_CONTINUATIONS",