diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index aa3935de6..76f6b1a64 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -5122,9 +5122,15 @@ static void HWR_ProjectSprite(mobj_t *thing)
 	spr_topoffset = spritecachedinfo[lumpoff].topoffset;
 
 #ifdef ROTSPRITE
-	rollangle = FixedMul(FINECOSINE((ang) >> ANGLETOFINESHIFT), thing->roll)
-		+ FixedMul(FINESINE((ang) >> ANGLETOFINESHIFT), thing->pitch)
-		+ thing->rollangle;
+	if (papersprite)
+		rollangle = thing->pitch // pitch should flip the sprite rotation on one side of the papersprite (OpenGL does this by default)
+			+ (ang >= ANGLE_180 ? -1 : 1) * thing->rollangle; // rollangle should use the same rotation for both sides of a papersprite (Software behavior parity)
+	else
+	{
+		rollangle = FixedMul(FINECOSINE((ang) >> ANGLETOFINESHIFT), thing->roll)
+			+ FixedMul(FINESINE((ang) >> ANGLETOFINESHIFT), thing->pitch)
+			+ thing->rollangle;
+	}
 	if (rollangle
 	&& !(splat && !(thing->renderflags & RF_NOSPLATROLLANGLE)))
 	{
diff --git a/src/r_things.c b/src/r_things.c
index c78f68c28..4ad737821 100644
--- a/src/r_things.c
+++ b/src/r_things.c
@@ -1579,9 +1579,15 @@ static void R_ProjectSprite(mobj_t *thing)
 	patch = W_CachePatchNum(sprframe->lumppat[rot], PU_SPRITE);
 
 #ifdef ROTSPRITE
-	rollangle = FixedMul(FINECOSINE((ang) >> ANGLETOFINESHIFT), thing->roll)
-		+ FixedMul(FINESINE((ang) >> ANGLETOFINESHIFT), thing->pitch)
-		+ thing->rollangle;
+	if (papersprite)
+		rollangle = (ang >= ANGLE_180 ? -1 : 1) * thing->pitch // pitch should flip the sprite rotation on one side of the papersprite
+			+ thing->rollangle; // rollangle should use the same rotation for both sides of a papersprite
+	else
+	{
+		rollangle = FixedMul(FINECOSINE((ang) >> ANGLETOFINESHIFT), thing->roll)
+			+ FixedMul(FINESINE((ang) >> ANGLETOFINESHIFT), thing->pitch)
+			+ thing->rollangle;
+	}
 	if (rollangle
 	&& !(splat && !(thing->renderflags & RF_NOSPLATROLLANGLE)))
 	{