diff --git a/sys/dev/fdt/fdt_powerpc.c b/sys/dev/fdt/fdt_powerpc.c
index ea614db..ac81c08 100644
--- a/sys/dev/fdt/fdt_powerpc.c
+++ b/sys/dev/fdt/fdt_powerpc.c
@@ -62,7 +62,7 @@ fdt_fixup_busfreq(phandle_t root)
 	 * This fixup uses /cpus/ bus-frequency prop value to set simple-bus
 	 * bus-frequency property.
 	 */
-	if ((cpus = OF_finddevice("/cpus")) == 0)
+	if ((cpus = OF_finddevice("/cpus")) == -1)
 		return;
 
 	if ((child = OF_child(cpus)) == 0)
diff --git a/sys/powerpc/booke/platform_bare.c b/sys/powerpc/booke/platform_bare.c
index ca3cfa2..f04bf96 100644
--- a/sys/powerpc/booke/platform_bare.c
+++ b/sys/powerpc/booke/platform_bare.c
@@ -189,7 +189,7 @@ bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
 	} else
 		ticks = 0;
 
-	if ((cpus = OF_finddevice("/cpus")) == 0)
+	if ((cpus = OF_finddevice("/cpus")) == -1)
 		goto out;
 
 	if ((child = OF_child(cpus)) == 0)