diff --git a/Source/Shaders/BillboardCollectionFS.glsl b/Source/Shaders/BillboardCollectionFS.glsl
index bb734972548d..cd2fae7b6368 100644
--- a/Source/Shaders/BillboardCollectionFS.glsl
+++ b/Source/Shaders/BillboardCollectionFS.glsl
@@ -23,10 +23,8 @@ float getGlobeDepth(vec2 adjustedST, vec2 depthLookupST)
     vec2 a = (v_imageSize.xy * (depthLookupST - adjustedST));
     vec2 Dd = v_dimensions - v_imageSize;
     vec2 px = v_translate.xy;
-    if (px != vec2(0.0))
-    {
-        px += v_dimensions * v_originTextureCoordinate;
-    }
+
+    px += v_dimensions * v_originTextureCoordinate * vec2(0, -1);
 
     vec2 st = ((a - px + (depthLookupST * Dd)) + gl_FragCoord.xy) / czm_viewport.zw;