diff --git a/runtime/src/z_Linux_asm.S b/runtime/src/z_Linux_asm.S
index 1197864..39bf427 100644
--- a/runtime/src/z_Linux_asm.S
+++ b/runtime/src/z_Linux_asm.S
@@ -1243,7 +1243,7 @@
 
 	orr	w9, wzr, #1
 	add	w9, w9, w3, lsr #1
-	sub	sp, sp, w9, lsl #4
+	sub	sp, sp, w9, uxtw #4
 	mov	x11, sp
 
 	mov	x8, x0