diff --git a/src/pkg/runtime/asm_arm.s b/src/pkg/runtime/asm_arm.s
index 9c36ba0d69..423fda7a0c 100644
--- a/src/pkg/runtime/asm_arm.s
+++ b/src/pkg/runtime/asm_arm.s
@@ -315,8 +315,8 @@ casfail:
 	RET
 
 TEXT runtime·stackguard(SB),7,$0
-	MOVL	R13, R1
-	MOVL	g_stackguard(g), R2
-	MOVL	R1, sp+0(FP)
-	MOVL	R2, limit+4(FP)
+	MOVW	R13, R1
+	MOVW	g_stackguard(g), R2
+	MOVW	R1, sp+0(FP)
+	MOVW	R2, limit+4(FP)
 	RET