diff --git a/sys/powerpc/aim/vm_machdep.c b/sys/powerpc/aim/vm_machdep.c
index e1bb3d78a835..1b58c1ec6b1d 100644
--- a/sys/powerpc/aim/vm_machdep.c
+++ b/sys/powerpc/aim/vm_machdep.c
@@ -197,7 +197,7 @@ void
 cpu_throw(struct thread *old, struct thread *new)
 {
 
-	cpu_switch(old, new);
+	cpu_switch(old, new, NULL);
 	panic("cpu_throw() didn't");
 }
 
diff --git a/sys/powerpc/powerpc/vm_machdep.c b/sys/powerpc/powerpc/vm_machdep.c
index e1bb3d78a835..1b58c1ec6b1d 100644
--- a/sys/powerpc/powerpc/vm_machdep.c
+++ b/sys/powerpc/powerpc/vm_machdep.c
@@ -197,7 +197,7 @@ void
 cpu_throw(struct thread *old, struct thread *new)
 {
 
-	cpu_switch(old, new);
+	cpu_switch(old, new, NULL);
 	panic("cpu_throw() didn't");
 }