diff --git a/test/format-test.cc b/test/format-test.cc
index 66d87c2d..08828ccb 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1917,7 +1917,7 @@ TEST(FormatTest, CustomFormatCompileTimeString) {
   EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), Answer()));
   Answer answer;
   EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), answer));
-  const Answer const_answer;
+  const Answer const_answer = Answer();
   EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), const_answer));
 }