diff --git a/dlls/wined3d/drawprim.c b/dlls/wined3d/drawprim.c
index b5e59b818dc..7214bf86827 100644
--- a/dlls/wined3d/drawprim.c
+++ b/dlls/wined3d/drawprim.c
@@ -732,6 +732,7 @@ static void depth_blt(IWineD3DDevice *iface, GLuint texture) {
     glDisable(GL_STENCIL_TEST);
     glEnable(GL_DEPTH_TEST);
     glDepthFunc(GL_ALWAYS);
+    glDepthMask(GL_TRUE);
     glBlendFunc(GL_ZERO, GL_ONE);
 
     GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB));