diff --git a/sys/src/9/pc/archacpi.c b/sys/src/9/pc/archacpi.c
index a9482fc83..7f9a52e51 100644
--- a/sys/src/9/pc/archacpi.c
+++ b/sys/src/9/pc/archacpi.c
@@ -260,9 +260,7 @@ pcibusno(void *dot)
 	if((x = amlwalk(dot, "^_BBN")) == nil)
 		if((x = amlwalk(dot, "^_ADR")) == nil)
 			return -1;
-	if((p = amlval(x)) == nil)
-		return -1;
-	adr = amlint(p);
+	adr = amlint(amlval(x));
 	/* if root bridge, then we are done here */
 	if(id != nil && (strcmp(id, "PNP0A03")==0 || strcmp(id, "PNP0A08")==0))
 		return adr;