diff --git a/Source/cmIncludeDirectoryCommand.cxx b/Source/cmIncludeDirectoryCommand.cxx
index 30c174375..e20fe022d 100644
--- a/Source/cmIncludeDirectoryCommand.cxx
+++ b/Source/cmIncludeDirectoryCommand.cxx
@@ -55,7 +55,7 @@ bool cmIncludeDirectoryCommand
 
     std::vector<std::string> includes;
 
-    GetIncludes(*i, includes);
+    this->GetIncludes(*i, includes);
 
     if (before)
       {