diff --git a/libc/arch-arm/bionic/tgkill.S b/libc/arch-arm/bionic/tgkill.S
index f46cb58..5f11b20 100644
--- a/libc/arch-arm/bionic/tgkill.S
+++ b/libc/arch-arm/bionic/tgkill.S
@@ -39,6 +39,7 @@
 */
 
 ENTRY(tgkill)
+    .save   {r4-r7, ip, lr}
     stmfd   sp!, {r4-r7, ip, lr}
     ldr     r7, =__NR_tgkill
     swi     #0