diff --git a/Makefile b/Makefile
index c02c392..2df7322 100755
--- a/Makefile
+++ b/Makefile
@@ -72,8 +72,8 @@ develop:
 	@echo "--------------------------------------------------------------------"
 	@echo "Building and installing $(PKG_NAME) development distributable: $@"
 	@echo ""
-
-	@./setup.py develop --no-deps -q
+	@pip3 uninstall -y ncdiff
+	@python3 setup.py develop --no-deps -q
 
 	@echo "Completed building and installing: $@"
 	@echo ""
diff --git a/src/ncdiff/manager.py b/src/ncdiff/manager.py
index 8bdf580..a4ee9d5 100755
--- a/src/ncdiff/manager.py
+++ b/src/ncdiff/manager.py
@@ -268,11 +268,11 @@ def scan_models(self, folder='./yang', download='check'):
             <Element modules at 0x7fbc044b6600>
             >>>
         '''
-
         if download in ['check', 'force']:
             d = ModelDownloader(self, folder)
             d.download_all(check_before_download=(download == 'check'))
-        self.compiler = ModelCompiler(folder)
+        if self.compiler is None:
+            self.compiler = ModelCompiler(folder)
 
     def load_model(self, model):
         '''load_model