diff --git a/indra/newview/lldrawpoolsimple.cpp b/indra/newview/lldrawpoolsimple.cpp
index 3221369fa07d183e12ef5040bfb0c32f22a10316..2cf9d833c60520d3f8d0f016c23a1d2394eaabb0 100755
--- a/indra/newview/lldrawpoolsimple.cpp
+++ b/indra/newview/lldrawpoolsimple.cpp
@@ -294,6 +294,7 @@ void LLDrawPoolAlphaMask::render(S32 pass)
 	}
 	else
 	{
+		LLGLEnable test(GL_ALPHA_TEST);
 		pushMaskBatches(LLRenderPass::PASS_ALPHA_MASK, getVertexDataMask(), TRUE, FALSE);
 		gGL.setAlphaRejectSettings(LLRender::CF_DEFAULT); //OK
 	}
@@ -370,6 +371,7 @@ void LLDrawPoolFullbrightAlphaMask::render(S32 pass)
 	}
 	else
 	{
+		LLGLEnable test(GL_ALPHA_TEST);
 		gPipeline.enableLightsFullbright(LLColor4(1,1,1,1));
 		pushMaskBatches(LLRenderPass::PASS_FULLBRIGHT_ALPHA_MASK, getVertexDataMask(), TRUE, FALSE);
 		gPipeline.enableLightsDynamic();