diff --git a/sys/arm/allwinner/clkng/aw_clk_m.c b/sys/arm/allwinner/clkng/aw_clk_m.c
index 1d3d5a9878f..2728ff230a9 100644
--- a/sys/arm/allwinner/clkng/aw_clk_m.c
+++ b/sys/arm/allwinner/clkng/aw_clk_m.c
@@ -135,7 +135,7 @@ static uint64_t
 aw_clk_m_find_best(struct aw_clk_m_sc *sc, uint64_t fparent, uint64_t *fout,
     uint32_t *factor_m)
 {
-	uint64_t cur, best;
+	uint64_t cur, best = 0;
 	uint32_t m, max_m, min_m;
 
 	*factor_m = 0;
diff --git a/sys/arm/allwinner/clkng/aw_clk_nm.c b/sys/arm/allwinner/clkng/aw_clk_nm.c
index a1cba2db5f7..61592eb04de 100644
--- a/sys/arm/allwinner/clkng/aw_clk_nm.c
+++ b/sys/arm/allwinner/clkng/aw_clk_nm.c
@@ -136,7 +136,7 @@ static uint64_t
 aw_clk_nm_find_best(struct aw_clk_nm_sc *sc, uint64_t fparent, uint64_t *fout,
     uint32_t *factor_n, uint32_t *factor_m)
 {
-	uint64_t cur, best;
+	uint64_t cur, best = 0;
 	uint32_t m, n, max_m, max_n, min_m, min_n;
 
 	*factor_n = *factor_m = 0;