diff --git a/src/lua_mobjlib.c b/src/lua_mobjlib.c
index 451ae6081..9a858c4b6 100644
--- a/src/lua_mobjlib.c
+++ b/src/lua_mobjlib.c
@@ -357,7 +357,7 @@ static int mobj_get(lua_State *L)
 		lua_pushinteger(L, mo->blendmode);
 		break;
 	case mobj_alpha:
-		lua_pushinteger(L, mo->alpha);
+		lua_pushfixed(L, mo->alpha);
 		break;
 	case mobj_bnext:
 		if (mo->blocknode && mo->blocknode->bnext) {
@@ -740,7 +740,7 @@ static int mobj_set(lua_State *L)
 	}
 	case mobj_alpha:
 	{
-		INT32 alpha = (INT32)luaL_checkinteger(L, 3);
+		fixed_t alpha = luaL_checkfixed(L, 3);
 		if (alpha < 0)
 			alpha = 0;
 		else if (alpha > FRACUNIT)
diff --git a/src/p_mobj.h b/src/p_mobj.h
index 401071295..545f0847f 100644
--- a/src/p_mobj.h
+++ b/src/p_mobj.h
@@ -313,7 +313,7 @@ typedef struct mobj_s
 
 	UINT32 renderflags; // render flags
 	INT32 blendmode; // blend mode
-	UINT32 alpha; // alpha
+	fixed_t alpha; // alpha
 	fixed_t spritexscale, spriteyscale;
 	fixed_t spritexoffset, spriteyoffset;
 	fixed_t old_spritexscale, old_spriteyscale;
@@ -457,6 +457,7 @@ typedef struct precipmobj_s
 
 	UINT32 renderflags; // render flags
 	INT32 blendmode; // blend mode
+	fixed_t alpha; // alpha
 	fixed_t spritexscale, spriteyscale;
 	fixed_t spritexoffset, spriteyoffset;
 	fixed_t old_spritexscale, old_spriteyscale;
diff --git a/src/p_saveg.c b/src/p_saveg.c
index 05cda779a..47f0b8297 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -1745,7 +1745,7 @@ typedef enum
 	MD2_DRAWONLYFORPLAYER   = 1<<24,
 	MD2_DONTDRAWFORVIEWMOBJ = 1<<25,
 	MD2_TRANSLATION         = 1<<26,
-	MD2_ALPHA				= 1<<27
+	MD2_ALPHA               = 1<<27
 } mobj_diff2_t;
 
 typedef enum
@@ -2174,7 +2174,7 @@ static void SaveMobjThinker(const thinker_t *th, const UINT8 type)
 	if (diff2 & MD2_TRANSLATION)
 		WRITEUINT16(save_p, mobj->translation);
 	if (diff2 & MD2_ALPHA)
-		WRITEUINT32(save_p, mobj->alpha);
+		WRITEFIXED(save_p, mobj->alpha);
 
 	WRITEUINT32(save_p, mobj->mobjnum);
 }
@@ -3242,7 +3242,7 @@ static thinker_t* LoadMobjThinker(actionf_p1 thinker)
 	if (diff2 & MD2_TRANSLATION)
 		mobj->translation = READUINT16(save_p);
 	if (diff2 & MD2_ALPHA)
-		mobj->alpha = READUINT32(save_p);
+		mobj->alpha = READFIXED(save_p);
 
 	if (diff & MD_REDFLAG)
 	{
diff --git a/src/r_things.c b/src/r_things.c
index defdc7aaa..843bf36ee 100644
--- a/src/r_things.c
+++ b/src/r_things.c
@@ -1276,7 +1276,7 @@ static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t scale,
 	floordiff = abs((isflipped ? interp.height : 0) + interp.z - groundz);
 
 	trans = floordiff / (100*FRACUNIT) + 3;
-	trans = R_GetTransmapFromAlpha(thing->alpha, trans);
+	trans = R_GetTransmapFromAlpha((UINT32)thing->alpha, trans);
 	if (trans >= 9) return;
 
 	scalemul = FixedMul(FRACUNIT - floordiff/640, scale);
@@ -1963,9 +1963,9 @@ static void R_ProjectSprite(mobj_t *thing)
 		trans = 0;
 	
 	if ((oldthing->flags2 & MF2_LINKDRAW) && oldthing->tracer)
-		trans = R_GetTransmapFromAlpha(oldthing->tracer->alpha, trans);
+		trans = R_GetTransmapFromAlpha((UINT32)oldthing->tracer->alpha, trans);
 	else
-		trans = R_GetTransmapFromAlpha(oldthing->alpha, trans);
+		trans = R_GetTransmapFromAlpha((UINT32)oldthing->alpha, trans);
 
 	// Check if this sprite needs to be rendered like a shadow
 	shadowdraw = (!!(thing->renderflags & RF_SHADOWDRAW) && !(papersprite || splat));
@@ -3428,7 +3428,7 @@ boolean R_ThingVisible (mobj_t *thing)
 		(thing->sprite == SPR_NULL) || // Don't draw null-sprites
 		(thing->flags2 & MF2_DONTDRAW) || // Don't draw MF2_LINKDRAW objects
 		(thing->drawonlyforplayer && thing->drawonlyforplayer != viewplayer) || // Don't draw other players' personal objects
-		((rendermode == render_soft && R_GetTransmapFromAlpha(thing->alpha, (thing->frame & FF_TRANSMASK)>>FF_TRANSSHIFT) >= 10) ||
+		((rendermode == render_soft && R_GetTransmapFromAlpha((UINT32)thing->alpha, (thing->frame & FF_TRANSMASK)>>FF_TRANSSHIFT) >= 10) ||
 		(rendermode == render_opengl && thing->alpha == 0)) ||
 		(!P_MobjWasRemoved(r_viewmobj) && (
 		  (r_viewmobj == thing) || // Don't draw first-person players or awayviewmobj objects