diff --git a/src/hardware/hw_defs.h b/src/hardware/hw_defs.h
index 70d776d9..02093955 100644
--- a/src/hardware/hw_defs.h
+++ b/src/hardware/hw_defs.h
@@ -109,6 +109,7 @@ typedef struct
 	FLOAT       fovxangle, fovyangle;
 	INT32       splitscreen;
 	boolean     flip;            // screenflip
+	boolean     mirror;          // SRB2Kart: Mirror Mode
 } FTransform;
 
 // Transformed vector, as passed to HWR API
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index a4785f12..6d1cdb4a 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -5591,6 +5591,11 @@ void HWR_RenderSkyboxView(INT32 viewnumber, player_t *player)
 	else
 		atransform.flip = false;
 
+	if (*type == postimg_mirror)
+		atransform.mirror = true;
+	else
+		atransform.mirror = false;
+
 	atransform.x      = gr_viewx;  // FIXED_TO_FLOAT(viewx)
 	atransform.y      = gr_viewy;  // FIXED_TO_FLOAT(viewy)
 	atransform.z      = gr_viewz;  // FIXED_TO_FLOAT(viewz)
@@ -5610,6 +5615,11 @@ void HWR_RenderSkyboxView(INT32 viewnumber, player_t *player)
 	else
 		stransform.flip = false;
 
+	if (*type == postimg_mirror)
+		stransform.mirror = true;
+	else
+		stransform.mirror = false;
+
 	stransform.x      = 0.0f;
 	stransform.y      = 0.0f;
 	stransform.z      = 0.0f;
@@ -5821,6 +5831,11 @@ void HWR_RenderPlayerView(INT32 viewnumber, player_t *player)
 	else
 		atransform.flip = false;
 
+	if (*type == postimg_mirror)
+		atransform.mirror = true;
+	else
+		atransform.mirror = false;
+
 	atransform.x      = gr_viewx;  // FIXED_TO_FLOAT(viewx)
 	atransform.y      = gr_viewy;  // FIXED_TO_FLOAT(viewy)
 	atransform.z      = gr_viewz;  // FIXED_TO_FLOAT(viewz)
@@ -5840,6 +5855,11 @@ void HWR_RenderPlayerView(INT32 viewnumber, player_t *player)
 	else
 		stransform.flip = false;
 
+	if (*type == postimg_mirror)
+		stransform.mirror = true;
+	else
+		stransform.mirror = false;
+
 	stransform.x      = 0.0f;
 	stransform.y      = 0.0f;
 	stransform.z      = 0.0f;
diff --git a/src/hardware/r_opengl/r_opengl.c b/src/hardware/r_opengl/r_opengl.c
index e6ff83e8..80da98c4 100644
--- a/src/hardware/r_opengl/r_opengl.c
+++ b/src/hardware/r_opengl/r_opengl.c
@@ -2013,7 +2013,9 @@ EXPORT void HWRAPI(SetTransform) (FTransform *stransform)
 		// keep a trace of the transformation for md2
 		memcpy(&md2_transform, stransform, sizeof (md2_transform));
 
-		if (stransform->flip)
+		if (stransform->mirror)
+			pglScalef(-stransform->scalex, stransform->scaley, -stransform->scalez);
+		else if (stransform->flip)
 			pglScalef(stransform->scalex, -stransform->scaley, -stransform->scalez);
 		else
 			pglScalef(stransform->scalex, stransform->scaley, -stransform->scalez);