diff --git a/src/net/http/fs.go b/src/net/http/fs.go
index d2144857e8430..b8a68cc460f5b 100644
--- a/src/net/http/fs.go
+++ b/src/net/http/fs.go
@@ -411,6 +411,7 @@ func checkIfNoneMatch(w ResponseWriter, r *Request) condResult {
 		}
 		if buf[0] == ',' {
 			buf = buf[1:]
+			continue
 		}
 		if buf[0] == '*' {
 			return condFalse
diff --git a/src/net/http/fs_test.go b/src/net/http/fs_test.go
index 435e34be3af08..c082ceee71b30 100644
--- a/src/net/http/fs_test.go
+++ b/src/net/http/fs_test.go
@@ -849,6 +849,15 @@ func TestServeContent(t *testing.T) {
 			wantStatus:      200,
 			wantContentType: "text/css; charset=utf-8",
 		},
+		"if_none_match_malformed": {
+			file:      "testdata/style.css",
+			serveETag: `"foo"`,
+			reqHeader: map[string]string{
+				"If-None-Match": `,`,
+			},
+			wantStatus:      200,
+			wantContentType: "text/css; charset=utf-8",
+		},
 		"range_good": {
 			file:      "testdata/style.css",
 			serveETag: `"A"`,