diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 425544b1f733..7f1748a1e614 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3966,7 +3966,7 @@ pipes_modified(struct drm_atomic_state *state)
 	return ret;
 }
 
-int
+static int
 skl_ddb_add_affected_planes(struct intel_crtc_state *cstate)
 {
 	struct drm_atomic_state *state = cstate->base.state;