diff --git a/sys/powerpc/aim/copyinout.c b/sys/powerpc/aim/copyinout.c
index a5683eb7fe7b..4c6a0ae48159 100644
--- a/sys/powerpc/aim/copyinout.c
+++ b/sys/powerpc/aim/copyinout.c
@@ -325,7 +325,7 @@ fuword32(const void *addr)
 uint32_t
 casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval)
 {
-	return (casuword(base, oldval, newval));
+	return (casuword((volatile u_long *)base, oldval, newval));
 }
 
 u_long
diff --git a/sys/powerpc/powerpc/copyinout.c b/sys/powerpc/powerpc/copyinout.c
index a5683eb7fe7b..4c6a0ae48159 100644
--- a/sys/powerpc/powerpc/copyinout.c
+++ b/sys/powerpc/powerpc/copyinout.c
@@ -325,7 +325,7 @@ fuword32(const void *addr)
 uint32_t
 casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval)
 {
-	return (casuword(base, oldval, newval));
+	return (casuword((volatile u_long *)base, oldval, newval));
 }
 
 u_long