diff --git a/panda/src/gobj/fog.h b/panda/src/gobj/fog.h
index 6156d050c9..f58be40dbe 100644
--- a/panda/src/gobj/fog.h
+++ b/panda/src/gobj/fog.h
@@ -33,7 +33,7 @@ PUBLISHED:
     M_spline,                   // Not implemented yet
   };
 
-  Fog(Mode mode = M_exponential, int hardware_bits = 8);
+  Fog(Mode mode = M_linear, int hardware_bits = 8);
   ~Fog();
 
   INLINE Mode get_mode(void) const;