diff --git a/acconfig.h b/acconfig.h
index 540703f06..3e3111502 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -67,8 +67,8 @@
 /* Define to avoid Christian's new weather code */
 #undef FG_NEW_ENVIRONMENT
 
-/* Define to use new experimental mouse input code */
-#undef FG_NEW_MOUSE
+/* Define to use old mouse support */
+#undef FG_OLD_MOUSE
    
 /* Define if we are building FGFS (should always be defined) */
 #undef FGFS
diff --git a/src/Input/input.cxx b/src/Input/input.cxx
index 749ca5714..18983b4ec 100644
--- a/src/Input/input.cxx
+++ b/src/Input/input.cxx
@@ -197,7 +197,7 @@ FGInput::init ()
   glutKeyboardUpFunc(GLUTkeyup);
   glutSpecialFunc(GLUTspecialkey);
   glutSpecialUpFunc(GLUTspecialkeyup);
-#ifdef FG_NEW_MOUSE
+#ifndef FG_OLD_MOUSE
   glutMouseFunc (GLUTmouse);
   glutMotionFunc (GLUTmotion);
   glutPassiveMotionFunc (GLUTmotion);
diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 7c099785a..2ba337327 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -1338,7 +1338,7 @@ int fgGlutInitEvents( void ) {
 
     // keyboard and mouse callbacks are set in FGInput::init
 
-#ifndef FG_NEW_MOUSE
+#ifdef FG_OLD_MOUSE
     // call guiMouseFunc() whenever our little rodent is used
     glutMouseFunc ( guiMouseFunc );
     glutMotionFunc (guiMotionFunc );