diff --git a/src/lib/dns/tests/master_lexer_state_unittest.cc b/src/lib/dns/tests/master_lexer_state_unittest.cc
index b5c1c96c8e..1ea2b9771c 100644
--- a/src/lib/dns/tests/master_lexer_state_unittest.cc
+++ b/src/lib/dns/tests/master_lexer_state_unittest.cc
@@ -481,7 +481,7 @@ TEST_F(MasterLexerStateTest, basicNumbers) {
 
     EXPECT_EQ(&s_number, State::start(lexer, common_options));
     s_number.handle(lexer);
-    EXPECT_EQ(4294967295, s_number.getToken(lexer).getNumber());
+    EXPECT_EQ(4294967295u, s_number.getToken(lexer).getNumber());
 
     EXPECT_EQ(&s_number, State::start(lexer, common_options));
     s_number.handle(lexer);