diff --git a/src/mesa/drivers/dri/i915/i830_vtbl.c b/src/mesa/drivers/dri/i915/i830_vtbl.c
index 2bf958509b5..64c1d58dc19 100644
--- a/src/mesa/drivers/dri/i915/i830_vtbl.c
+++ b/src/mesa/drivers/dri/i915/i830_vtbl.c
@@ -215,6 +215,9 @@ i830_reduced_primitive_state(struct intel_context *intel, GLenum rprim)
    i830->intel.reduced_primitive = rprim;
 
    if (st1 != i830->state.Stipple[I830_STPREG_ST1]) {
+      if (intel->prim.flush)
+         intel->prim.flush(intel);
+
       I830_STATECHANGE(i830, I830_UPLOAD_STIPPLE);
       i830->state.Stipple[I830_STPREG_ST1] = st1;
    }
diff --git a/src/mesa/drivers/dri/i915/i915_vtbl.c b/src/mesa/drivers/dri/i915/i915_vtbl.c
index c29875b502e..9fbdf76feda 100644
--- a/src/mesa/drivers/dri/i915/i915_vtbl.c
+++ b/src/mesa/drivers/dri/i915/i915_vtbl.c
@@ -74,6 +74,9 @@ i915_reduced_primitive_state(struct intel_context *intel, GLenum rprim)
    i915->intel.reduced_primitive = rprim;
 
    if (st1 != i915->state.Stipple[I915_STPREG_ST1]) {
+      if (intel->prim.flush)
+         intel->prim.flush(intel);
+
       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
       i915->state.Stipple[I915_STPREG_ST1] = st1;
    }