diff --git a/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.c b/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.c
index 72689969c..16581bc3e 100644
--- a/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.c
+++ b/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.c
@@ -41,7 +41,7 @@ static int vfflatten_prog_1x_master(struct gk20a *g,
 				    struct clk_pmupstate *pclk,
 				    struct clk_prog_1x_master *p1xmaster,
 				    u8 clk_domain_idx, u16 *pfreqmaxlastmhz);
-static u32 vflookup_prog_1x_master(struct gk20a *g,
+static int vflookup_prog_1x_master(struct gk20a *g,
 				   struct clk_pmupstate *pclk,
 				   struct clk_prog_1x_master *p1xmaster,
 				   u8 *slave_clk_domain,
@@ -1474,7 +1474,7 @@ done:
 	return status;
 }
 
-static u32 vflookup_prog_1x_master
+static int vflookup_prog_1x_master
 (
 	struct gk20a *g,
 	struct clk_pmupstate *pclk,
diff --git a/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.h b/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.h
index c6241f4d2..3033449b2 100644
--- a/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.h
+++ b/drivers/gpu/nvgpu/common/pmu/clk/clk_prog.h
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+* Copyright (c) 2016-2019, NVIDIA CORPORATION.  All rights reserved.
 *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -36,7 +36,7 @@ typedef int vf_flatten(struct gk20a *g, struct clk_pmupstate *pclk,
 			struct clk_prog_1x_master *p1xmaster,
 			u8 clk_domain_idx, u16 *pfreqmaxlastmhz);
 
-typedef u32 vf_lookup(struct gk20a *g, struct clk_pmupstate *pclk,
+typedef int vf_lookup(struct gk20a *g, struct clk_pmupstate *pclk,
 			struct clk_prog_1x_master *p1xmaster,
 			u8 *slave_clk_domain_idx, u16 *pclkmhz,
 			u32 *pvoltuv, u8 rail);