diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 64904dbd9b0..d96d24e4b10 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -184,6 +184,14 @@ struct pipe_rasterizer_state
     */
    unsigned offset_units_unscaled:1;
 
+   /**
+    * Depth values output from fragment shader may be outside 0..1.
+    * These have to be clamped for use with UNORM buffers.
+    * Vulkan can allow this with an extension,
+    * GL could with NV_depth_buffer_float, but GLES doesn't.
+    */
+   unsigned unclamped_fragment_depth_values:1;
+
    /**
     * Enable bits for clipping half-spaces.
     * This applies to both user clip planes and shader clip distances.