diff --git a/arch/avr32/lib/io-readsb.S b/arch/avr32/lib/io-readsb.S
index b319d5e71749..2be5da7ed26b 100644
--- a/arch/avr32/lib/io-readsb.S
+++ b/arch/avr32/lib/io-readsb.S
@@ -45,3 +45,5 @@ __raw_readsb:
 	sub	r10, 1
 	st.b	r11++, r8
 	brne	3b
+
+	retal	r12