diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 083ba23fb..aff990907 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -3878,7 +3878,7 @@ AActor *AActor::StaticSpawn (const PClass *type, fixed_t ix, fixed_t iy, fixed_t
 		actor->SpawnPoint[2] = (actor->z - actor->floorz);
 	}
 
-	if (actor->FloatBobPhase < 0) actor->FloatBobPhase = rng();	// Don't make everything bob in sync (unless deliberately told to do)
+	if (actor->FloatBobPhase == (BYTE)-1) actor->FloatBobPhase = rng();	// Don't make everything bob in sync (unless deliberately told to do)
 	if (actor->flags2 & MF2_FLOORCLIP)
 	{
 		actor->AdjustFloorClip ();