diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 2296d5a33b..73911a5919 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2049,6 +2049,10 @@ void cmMakefile::SetProjectName(const char* p)
   this->ProjectName = p;
 }
 
+const char* cmMakefile::GetProjectName() const
+{
+  return this->ProjectName.c_str();
+}
 
 void cmMakefile::AddGlobalLinkInformation(const std::string& name,
                                           cmTarget& target)
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 055170a624..959f0e74f9 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -279,10 +279,7 @@ public:
   /**
    * Get the name of the project for this build.
    */
-  const char* GetProjectName() const
-    {
-      return this->ProjectName.c_str();
-    }
+  const char* GetProjectName() const;
 
   /** Get the configurations to be generated.  */
   std::string GetConfigurations(std::vector<std::string>& configs,