diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index acaed36728..fcd3b231a6 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -2517,7 +2517,7 @@ bool cmGlobalNinjaGenerator::WriteDyndepFile(
   // Populate the module map with those provided by linked targets first.
   for (std::string const& linked_target_dir : linked_target_dirs) {
     std::string const ltmn =
-      cmStrCat(linked_target_dir, "/", arg_lang, "Modules.json");
+      cmStrCat(linked_target_dir, '/', arg_lang, "Modules.json");
     Json::Value ltm;
     cmsys::ifstream ltmf(ltmn.c_str(), std::ios::in | std::ios::binary);
     Json::Reader reader;