diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c
index 0690c346f2c5..a4f14b16564c 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_cm_common.c
@@ -163,6 +163,11 @@ bool cm3_helper_translate_curve_to_hw_format(
 			hw_points += (1 << seg_distr[k]);
 	}
 
+	// DCN3+ have 257 pts in lieu of no separate slope registers
+	// Prior HW had 256 base+slope pairs
+	// Shaper LUT (i.e. fixpoint == true) is still 256 bases and 256 deltas
+	hw_points = fixpoint ? (hw_points - 1) : hw_points;
+
 	j = 0;
 	for (k = 0; k < (region_end - region_start); k++) {
 		increment = NUMBER_SW_SEGMENTS / (1 << seg_distr[k]);
@@ -223,8 +228,6 @@ bool cm3_helper_translate_curve_to_hw_format(
 	corner_points[1].green.slope = dc_fixpt_zero;
 	corner_points[1].blue.slope = dc_fixpt_zero;
 
-	// DCN3+ have 257 pts in lieu of no separate slope registers
-	// Prior HW had 256 base+slope pairs
 	lut_params->hw_points_num = hw_points + 1;
 
 	k = 0;