diff --git a/src/gl/scene/gl_portal.cpp b/src/gl/scene/gl_portal.cpp
index 74af305c3..50b7fc9bb 100644
--- a/src/gl/scene/gl_portal.cpp
+++ b/src/gl/scene/gl_portal.cpp
@@ -661,7 +661,6 @@ void GLSkyboxPortal::DrawContents()
 
 	GLRenderer->mViewActor = origin;
 
-	validcount++;
 	inskybox = true;
 	GLRenderer->SetupView(ViewPos.X, ViewPos.Y, ViewPos.Z, ViewAngle, !!(MirrorFlag & 1), !!(PlaneMirrorFlag & 1));
 	GLRenderer->SetViewArea();
@@ -755,9 +754,6 @@ void GLSectorStackPortal::DrawContents()
 	ViewPos += origin->mDisplacement;
 	GLRenderer->mViewActor = NULL;
 
-
-	validcount++;
-
 	// avoid recursions!
 	if (origin->plane != -1) instack[origin->plane]++;
 
@@ -803,8 +799,6 @@ void GLPlaneMirrorPortal::DrawContents()
 	PlaneMirrorMode = origin->fC() < 0 ? -1 : 1;
 	r_showviewer = true;
 
-	validcount++;
-
 	PlaneMirrorFlag++;
 	GLRenderer->SetupView(ViewPos.X, ViewPos.Y, ViewPos.Z, ViewAngle, !!(MirrorFlag&1), !!(PlaneMirrorFlag&1));
 	ClearClipper();
@@ -916,8 +910,6 @@ void GLMirrorPortal::DrawContents()
 	GLRenderer->mViewActor = NULL;
 	r_showviewer = true;
 
-	validcount++;
-
 	MirrorFlag++;
 	GLRenderer->SetupView(ViewPos.X, ViewPos.Y, ViewPos.Z, ViewAngle, !!(MirrorFlag&1), !!(PlaneMirrorFlag&1));
 
@@ -1028,7 +1020,6 @@ void GLLineToLinePortal::DrawContents()
 	}
 
 	GLRenderer->mViewActor = NULL;
-	validcount++;
 	GLRenderer->SetupView(ViewPos.X, ViewPos.Y, ViewPos.Z, ViewAngle, !!(MirrorFlag&1), !!(PlaneMirrorFlag&1));
 
 	ClearClipper();
diff --git a/src/gl/scene/gl_scene.cpp b/src/gl/scene/gl_scene.cpp
index acb8416a4..9c2f6505c 100644
--- a/src/gl/scene/gl_scene.cpp
+++ b/src/gl/scene/gl_scene.cpp
@@ -306,6 +306,7 @@ void FGLRenderer::CreateScene()
 	gl_spriteindex=0;
 	Bsp.Clock();
 	R_SetView();
+	validcount++;	// used for processing sidedefs only once by the renderer.
 	gl_RenderBSPNode (nodes + numnodes - 1);
 	Bsp.Unclock();