diff --git a/src/p_mobj.c b/src/p_mobj.c
index 876bcf03d..6ffc84c66 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -148,11 +148,17 @@ FUNCINLINE static ATTRINLINE void P_CycleStateAnimation(mobj_t *mobj)
 
 	if (mobj->sprite != SPR_PLAY)
 	{
+		const UINT8 start = mobj->state->frame & FF_FRAMEMASK;
+
+		UINT8 frame = mobj->frame & FF_FRAMEMASK;
+
 		// compare the current sprite frame to the one we started from
 		// if more than var1 away from it, swap back to the original
 		// else just advance by one
-		if (((++mobj->frame) & FF_FRAMEMASK) - (mobj->state->frame & FF_FRAMEMASK) > (UINT32)mobj->state->var1)
-			mobj->frame = (mobj->state->frame & FF_FRAMEMASK) | (mobj->frame & ~FF_FRAMEMASK);
+		if ((mobj->frame & FF_REVERSEANIM ? (start - (--frame)) : ((++frame) - start)) > mobj->state->var1)
+			frame = start;
+
+		mobj->frame = frame | (mobj->frame & ~FF_FRAMEMASK);
 
 		return;
 	}
diff --git a/src/p_pspr.h b/src/p_pspr.h
index ff2ead048..a805bbb40 100644
--- a/src/p_pspr.h
+++ b/src/p_pspr.h
@@ -96,6 +96,8 @@
 #define FF_GLOBALANIM 0x20000000
 /// \brief Frame flags - Animate: Start at a random place in the animation (mutually exclusive with above)
 #define FF_RANDOMANIM 0x40000000
+/// \brief Frame flags - Animate: Animate in reverse
+#define FF_REVERSEANIM 0x80000000
 
 /**	\brief translucency tables