diff --git a/src/libutil-tests/json-utils.cc b/src/libutil-tests/json-utils.cc
index d9a223107..489501598 100644
--- a/src/libutil-tests/json-utils.cc
+++ b/src/libutil-tests/json-utils.cc
@@ -147,7 +147,7 @@ TEST(getIntegralNumber, rightAssertions)
 {
     auto simple = R"({ "int": 0, "signed": -1 })"_json;
 
-    ASSERT_EQ(getUnsigned(valueAt(getObject(simple), "int")), 0);
+    ASSERT_EQ(getUnsigned(valueAt(getObject(simple), "int")), 0u);
     ASSERT_EQ(getInteger<int8_t>(valueAt(getObject(simple), "int")), 0);
     ASSERT_EQ(getInteger<int8_t>(valueAt(getObject(simple), "signed")), -1);
 }