diff --git a/src/tools/vppapigen/vppapigen.py b/src/tools/vppapigen/vppapigen.py
index f3094ec..9d04ec2 100755
--- a/src/tools/vppapigen/vppapigen.py
+++ b/src/tools/vppapigen/vppapigen.py
@@ -785,14 +785,14 @@
                     '/../share/vpp/')
         for c in cand:
             c += '/'
-            if os.path.isfile(c + args.output_module + '.py'):
+            if os.path.isfile('{}vppapigen_{}.py'.format(c, args.output_module.lower())):
                 pluginpath = c
                 break
     else:
         pluginpath = args.pluginpath + '/'
     if pluginpath == '':
         raise Exception('Output plugin not found')
-    module_path = pluginpath + args.output_module + '.py'
+    module_path = '{}vppapigen_{}.py'.format(pluginpath, args.output_module.lower())
 
     try:
         plugin = imp.load_source(args.output_module, module_path)