diff --git a/src/osgPlugins/cfg/ConfigParser.cpp b/src/osgPlugins/cfg/ConfigParser.cpp
index 0e51f35b9..263c82896 100644
--- a/src/osgPlugins/cfg/ConfigParser.cpp
+++ b/src/osgPlugins/cfg/ConfigParser.cpp
@@ -1118,6 +1118,7 @@ yydestruct (yytype, yyvaluep)
 #endif
 {
   /* Pacify ``unused variable'' warnings.  */
+  (void) yytype;
   (void) yyvaluep;
 
 }