diff --git a/cpu/mpc83xx/fdt.c b/cpu/mpc83xx/fdt.c
index 267ae6adc53a0c0563f0e8cd290e3c7d71e21fbd..fda85c15d0e572e63828f6a16b28a1dc33d12375 100644
--- a/cpu/mpc83xx/fdt.c
+++ b/cpu/mpc83xx/fdt.c
@@ -78,7 +78,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 #ifdef CFG_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-		"clock-frequency", bd->bi_busfreq, 1);
+		"clock-frequency", CFG_NS16550_CLK, 1);
 #endif
 
 	fdt_fixup_memory(blob, (u64)bd->bi_memstart, (u64)bd->bi_memsize);
diff --git a/cpu/mpc85xx/fdt.c b/cpu/mpc85xx/fdt.c
index c8d2c6ac22066419106bce85c9e4544c5ad70bde..c159934c5b24630e6c906a748e3dead91e0a9252 100644
--- a/cpu/mpc85xx/fdt.c
+++ b/cpu/mpc85xx/fdt.c
@@ -229,7 +229,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 #ifdef CFG_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-		"clock-frequency", bd->bi_busfreq, 1);
+		"clock-frequency", CFG_NS16550_CLK, 1);
 #endif
 
 #ifdef CONFIG_CPM2
diff --git a/cpu/mpc86xx/fdt.c b/cpu/mpc86xx/fdt.c
index 379306ea4f302ff51d5371a73e531b9bcbb48d94..80a5c78a79436c2c98721b9666b21008a82fbcfc 100644
--- a/cpu/mpc86xx/fdt.c
+++ b/cpu/mpc86xx/fdt.c
@@ -30,6 +30,6 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 
 #ifdef CFG_NS16550
 	do_fixup_by_compat_u32(blob, "ns16550",
-			       "clock-frequency", bd->bi_busfreq, 1);
+			       "clock-frequency", CFG_NS16550_CLK, 1);
 #endif
 }