diff --git a/src/objects/spb.c b/src/objects/spb.c
index 4f056a45f..d34da47bb 100644
--- a/src/objects/spb.c
+++ b/src/objects/spb.c
@@ -154,7 +154,7 @@ static void SpawnSPBDust(mobj_t *spb)
 	angle_t sa = spb->angle - ANG1*60;
 	INT32 i;
 
-	if ((spb_intangible(spb) = SPB_FLASHING)) // If the SPB is intangible, don't spawn the "v" dust wave
+	if ((spb_intangible(spb) != SPB_FLASHING)) // If the SPB is intangible, don't spawn the "v" dust wave
 	{
 	if (spb->eflags & MFE_VERTICALFLIP)
 	{
@@ -205,7 +205,7 @@ static void SpawnSPBSliptide(mobj_t *spb, SINT8 dir)
 	angle_t travelangle;
 	fixed_t sz = spb->floorz;
 
-	if ((spb_intangible(spb) = SPB_FLASHING)) // Tired of this thing whacking people when switching targets, don't sliptide if intangible either
+	if ((spb_intangible(spb) != SPB_FLASHING)) // Tired of this thing whacking people when switching targets, don't sliptide if intangible either
 	 { 
 		if (spb->eflags & MFE_VERTICALFLIP)
 		{