diff --git a/python/ycm/completers/cpp/clang_completer.py b/python/ycm/completers/cpp/clang_completer.py
index 3e2e318a..5aebae8e 100644
--- a/python/ycm/completers/cpp/clang_completer.py
+++ b/python/ycm/completers/cpp/clang_completer.py
@@ -152,7 +152,7 @@ class ClangCompleter( Completer ):
     elif command == 'GoToDefinitionElseDeclaration':
       return self._GoToDefinitionElseDeclaration( request_data )
     elif command == 'ClearCompilationFlagCache':
-      return self._ClearCompilationFlagCache( request_data )
+      return self._ClearCompilationFlagCache()
     raise ValueError( self.UserCommandsHelpMessage() )