diff --git a/sys/arm/cloudabi32/cloudabi32_sysvec.c b/sys/arm/cloudabi32/cloudabi32_sysvec.c
index ebcbf3f285c..c2b5a732d56 100644
--- a/sys/arm/cloudabi32/cloudabi32_sysvec.c
+++ b/sys/arm/cloudabi32/cloudabi32_sysvec.c
@@ -165,7 +165,7 @@ cloudabi32_thread_setregs(struct thread *td,
 	frame->tf_r1 = attr->argument;
 
 	/* Set up TLS. */
-	return (cpu_set_user_tls(td, (void *)tcb));
+	return (cpu_set_user_tls(td, TO_PTR(tcb)));
 }
 
 static struct sysentvec cloudabi32_elf_sysvec = {
diff --git a/sys/arm64/cloudabi64/cloudabi64_sysvec.c b/sys/arm64/cloudabi64/cloudabi64_sysvec.c
index 3cf8e775229..2caa7a643e6 100644
--- a/sys/arm64/cloudabi64/cloudabi64_sysvec.c
+++ b/sys/arm64/cloudabi64/cloudabi64_sysvec.c
@@ -157,7 +157,7 @@ cloudabi64_thread_setregs(struct thread *td,
 	frame->tf_x[1] = attr->argument;
 
 	/* Set up TLS. */
-	return (cpu_set_user_tls(td, (void *)tcb));
+	return (cpu_set_user_tls(td, TO_PTR(tcb)));
 }
 
 static struct sysentvec cloudabi64_elf_sysvec = {