diff --git a/src/insets/ExternalTemplate.cpp b/src/insets/ExternalTemplate.cpp
index 02f4e875a5..e7eca8b274 100644
--- a/src/insets/ExternalTemplate.cpp
+++ b/src/insets/ExternalTemplate.cpp
@@ -36,7 +36,7 @@ typedef Translator<TransformID, string> TransformIDTranslator;
 
 static TransformIDTranslator const initIDTranslator()
 {
-	TransformIDTranslator translator(TransformID(-1), "");
+	TransformIDTranslator translator(None, "");
 	translator.addPair(Rotate, "Rotate");
 	translator.addPair(Resize, "Resize");
 	translator.addPair(Clip,   "Clip");
diff --git a/src/insets/ExternalTransforms.h b/src/insets/ExternalTransforms.h
index 62e3342352..2311ac2f66 100644
--- a/src/insets/ExternalTransforms.h
+++ b/src/insets/ExternalTransforms.h
@@ -307,6 +307,7 @@ std::string const sanitizeDocBookOption(std::string const & input);
 
 
 enum TransformID {
+	None = -1,
 	Rotate,
 	Resize,
 	Clip,