diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index c07fd0f24..17c8a4d82 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -2673,7 +2673,7 @@ const char *cmTarget::GetProperty(const std::string& prop,
     // Support "<CONFIG>_LOCATION".
     if(cmHasLiteralSuffix(prop, "_LOCATION"))
       {
-      std::string configName(prop, strlen(prop) - 9);
+      std::string configName(prop.c_str(), prop.size() - 9);
       if(configName != "IMPORTED")
         {
         if (!this->HandleLocationPropertyPolicy())
@@ -2681,7 +2681,7 @@ const char *cmTarget::GetProperty(const std::string& prop,
           return 0;
           }
         this->Properties.SetProperty(prop,
-                                     this->GetLocation(configName.c_str()),
+                                     this->GetLocation(configName),
                                      cmProperty::TARGET);
         }
       }