diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 1ce7cb0e..5a027e13 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -24,3 +24,4 @@ endfunction ()
 # Writing a wide character to a character stream Writer is forbidden.
 expect_compile_error("fmt::Writer() << L'a';")
 expect_compile_error("fmt::Writer() << fmt::pad(\"abc\", 5, L' ');")
+expect_compile_error("fmt::Writer() << fmt::pad(42, 5, L' ');")