diff --git a/plugins/GSdx/GSRendererDX.cpp b/plugins/GSdx/GSRendererDX.cpp
index 2dafe8750b..cb7aa8f24a 100644
--- a/plugins/GSdx/GSRendererDX.cpp
+++ b/plugins/GSdx/GSRendererDX.cpp
@@ -606,10 +606,10 @@ void GSRendererDX::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sourc
 		}
 
 		if (ate_RGBA_then_Z) {
-			z = true;
+			z = !m_context->ZBUF.ZMSK;
 			r = g = b = a = false;
 		} else if (ate_RGB_then_ZA) {
-			z = true;
+			z = !m_context->ZBUF.ZMSK;
 			a = !!(m_context->FRAME.FBMSK & 0xFF000000);
 			r = g = b = false;
 		}
diff --git a/plugins/GSdx/GSRendererOGL.cpp b/plugins/GSdx/GSRendererOGL.cpp
index ace1725e6a..d87825f08f 100644
--- a/plugins/GSdx/GSRendererOGL.cpp
+++ b/plugins/GSdx/GSRendererOGL.cpp
@@ -1460,10 +1460,10 @@ void GSRendererOGL::DrawPrims(GSTexture* rt, GSTexture* ds, GSTextureCache::Sour
 		}
 
 		if (ate_RGBA_then_Z) {
-			z = true;
+			z = !m_context->ZBUF.ZMSK;
 			r = g = b = a = false;
 		} else if (ate_RGB_then_ZA) {
-			z = true;
+			z = !m_context->ZBUF.ZMSK;
 			a = !!(m_context->FRAME.FBMSK & 0xFF000000);
 			r = g = b = false;
 		}