diff --git a/SPIRV/Logger.cpp b/SPIRV/Logger.cpp
index 2977ea39..7edf4265 100644
--- a/SPIRV/Logger.cpp
+++ b/SPIRV/Logger.cpp
@@ -40,13 +40,13 @@
 
 namespace spv {
 
-void SpvBuildLogger::tbdFunctionality(const char* f)
+void SpvBuildLogger::tbdFunctionality(const std::string& f)
 {
     if (std::find(std::begin(tbdFeatures), std::end(tbdFeatures), f) == std::end(tbdFeatures))
         tbdFeatures.push_back(f);
 }
 
-void SpvBuildLogger::missingFunctionality(const char* f)
+void SpvBuildLogger::missingFunctionality(const std::string& f)
 {
     if (std::find(std::begin(missingFeatures), std::end(missingFeatures), f) == std::end(missingFeatures))
         missingFeatures.push_back(f);
diff --git a/SPIRV/Logger.h b/SPIRV/Logger.h
index 2b9eb0d5..15b5e354 100644
--- a/SPIRV/Logger.h
+++ b/SPIRV/Logger.h
@@ -48,9 +48,9 @@ public:
     SpvBuildLogger(const SpvBuildLogger&) = delete;
 
     // Registers a TBD functionality.
-    void tbdFunctionality(const char* f);
+    void tbdFunctionality(const std::string& f);
     // Registers a missing functionality.
-    void missingFunctionality(const char* f);
+    void missingFunctionality(const std::string& f);
 
     // Logs a warning.
     void warning(const std::string& w) { warnings.push_back(w); }
@@ -62,8 +62,8 @@ public:
     std::string getAllMessages() const;
 
 private:
-    std::vector<const char*> tbdFeatures;
-    std::vector<const char*> missingFeatures;
+    std::vector<std::string> tbdFeatures;
+    std::vector<std::string> missingFeatures;
     std::vector<std::string> warnings;
     std::vector<std::string> errors;
 };