diff --git a/Source/DoxygenTranslator/src/DoxygenParser.cpp b/Source/DoxygenTranslator/src/DoxygenParser.cpp
index ef3997cf7..5b235f91e 100644
--- a/Source/DoxygenTranslator/src/DoxygenParser.cpp
+++ b/Source/DoxygenTranslator/src/DoxygenParser.cpp
@@ -138,7 +138,7 @@ int DoxygenParser::commandBelongs(const std::string &theCommand)
   if (it != doxygenCommands.end()) {
     return it->second;
   }
-  return 0;
+  return NONE;
 }
 
 std::string DoxygenParser::trim(const std::string &text)
diff --git a/Source/DoxygenTranslator/src/DoxygenParser.h b/Source/DoxygenTranslator/src/DoxygenParser.h
index 06c14de04..0b1212d4b 100644
--- a/Source/DoxygenTranslator/src/DoxygenParser.h
+++ b/Source/DoxygenTranslator/src/DoxygenParser.h
@@ -22,6 +22,7 @@ class DoxygenParser {
 private:
 
   typedef enum {
+    NONE = -1,
     SIMPLECOMMAND,
     COMMANDWORD,
     COMMANDLINE,