diff --git a/mach/m68k4/libem/nop.s b/mach/m68k4/libem/nop.s
index 9b8f3dd8e..ed7720d13 100644
--- a/mach/m68k4/libem/nop.s
+++ b/mach/m68k4/libem/nop.s
@@ -2,12 +2,13 @@
 
 	.text
 .nop:
+	pea	4(sp)
 	move.l	hol0,-(sp)
 	pea	fmt
 	jsr	.diagnos
-	add.l	#8,sp
+	add.l	#12,sp
 	rts
 
 	.data
-fmt:	.asciz "test %d\n"
+fmt:	.asciz "test %d, sp %d\n"
 .align 2