diff --git a/Source/cmAlgorithms.h b/Source/cmAlgorithms.h
index ef607d212..54617f30f 100644
--- a/Source/cmAlgorithms.h
+++ b/Source/cmAlgorithms.h
@@ -52,13 +52,13 @@ template<typename T, size_t N>
 size_t cmArraySize(const T (&)[N]) { return N; }
 
 template<typename T, size_t N>
-bool cmHasLiteralPrefix(T str1, const char (&str2)[N])
+bool cmHasLiteralPrefix(const T& str1, const char (&str2)[N])
 {
   return cmHasLiteralPrefixImpl(str1, str2, N - 1);
 }
 
 template<typename T, size_t N>
-bool cmHasLiteralSuffix(T str1, const char (&str2)[N])
+bool cmHasLiteralSuffix(const T& str1, const char (&str2)[N])
 {
   return cmHasLiteralSuffixImpl(str1, str2, N - 1);
 }