diff --git a/sys/src/9/mtx/mmu.c b/sys/src/9/mtx/mmu.c
index c4030ce8f..7afd68a3f 100644
--- a/sys/src/9/mtx/mmu.c
+++ b/sys/src/9/mtx/mmu.c
@@ -85,10 +85,11 @@ mmusweep(void*)
 
 		sweepcolor = m->sweepcolor;
 		x = splhi();
-		p = proctab(0);
-		for(i = 0; i < conf.nproc; i++, p++)
+		for(i = 0; i < conf.nproc; i++) {
+			p = proctab(i);
 			if(PIDCOLOR(p->mmupid) == sweepcolor)
 				p->mmupid = 0;
+		}
 		splx(x);
 
 		ptab = (ulong*)m->ptabbase;
diff --git a/sys/src/9/ppc/mmu.c b/sys/src/9/ppc/mmu.c
index 88ef49e2d..59e59c229 100644
--- a/sys/src/9/ppc/mmu.c
+++ b/sys/src/9/ppc/mmu.c
@@ -89,10 +89,11 @@ mmusweep(void*)
 
 		sweepcolor = m->sweepcolor;
 		x = splhi();
-		p = proctab(0);
-		for(i = 0; i < conf.nproc; i++, p++)
+		for(i = 0; i < conf.nproc; i++){
+			p = proctab(i);
 			if(PIDCOLOR(p->mmupid) == sweepcolor)
 				p->mmupid = 0;
+		}
 		splx(x);
 
 		ptab = (ulong*)m->ptabbase;
@@ -125,9 +126,10 @@ newmmupid(void)
 		m->mmupid = PIDBASE;
 		x = splhi();
 		tlbflushall();
-		p = proctab(0);
-		for(i = 0; i < conf.nproc; i++, p++)
+		for(i = 0; i < conf.nproc; i++){
+			p = proctab(i);
 			p->mmupid = 0;
+		}
 		splx(x);
 		wakeup(&m->sweepr);
 	}