diff --git a/source/blender/render/intern/source/render_texture.c b/source/blender/render/intern/source/render_texture.c
index bd323a5b2d3..323f04cbd04 100644
--- a/source/blender/render/intern/source/render_texture.c
+++ b/source/blender/render/intern/source/render_texture.c
@@ -3007,7 +3007,7 @@ void do_sky_tex(const float rco[3], float lo[3], const float dxyview[2], float h
 	TexResult texres= {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0, NULL};
 	float *co, fact, stencilTin=1.0;
 	float tempvec[3], texvec[3], dxt[3], dyt[3];
-	int tex_nr, rgb= 0, ok;
+	int tex_nr, rgb= 0;
 	
 	if (R.r.scemode & R_NO_TEX) return;
 	/* todo: add flag to test if there's a tex */
@@ -3171,18 +3171,21 @@ void do_sky_tex(const float rco[3], float lo[3], const float dxyview[2], float h
 					texture_rgb_blend(hor, tcol, hor, texres.tin, mtex->colfac, mtex->blendtype);
 				}
 				if(mtex->mapto & (WOMAP_ZENUP+WOMAP_ZENDOWN)) {
-					ok= 0;
+					float zenfac = 0.0f;
+
 					if(R.wrld.skytype & WO_SKYREAL) {
 						if((skyflag & WO_ZENUP)) {
-							if(mtex->mapto & WOMAP_ZENUP) ok= 1;
+							if(mtex->mapto & WOMAP_ZENUP) zenfac= mtex->zenupfac;
 						}
-						else if(mtex->mapto & WOMAP_ZENDOWN) ok= 1;
+						else if(mtex->mapto & WOMAP_ZENDOWN) zenfac= mtex->zendownfac;
+					}
+					else {
+						if(mtex->mapto & WOMAP_ZENUP) zenfac= mtex->zenupfac;
+						else if(mtex->mapto & WOMAP_ZENDOWN) zenfac= mtex->zendownfac;
 					}
-					else ok= 1;
 					
-					if(ok) {
-						texture_rgb_blend(zen, tcol, zen, texres.tin, mtex->colfac, mtex->blendtype);
-					}
+					if(zenfac != 0.0f)
+						texture_rgb_blend(zen, tcol, zen, texres.tin, zenfac, mtex->blendtype);
 				}
 			}
 			if(mtex->mapto & WOMAP_BLEND) {