diff --git a/libgo/runtime/malloc.goc b/libgo/runtime/malloc.goc
index b8b4a2dc373b..a06dd11811f1 100644
--- a/libgo/runtime/malloc.goc
+++ b/libgo/runtime/malloc.goc
@@ -637,8 +637,7 @@ runtime_settype_flush(M *mp)
 
 		// (Manually inlined copy of runtime_MHeap_Lookup)
 		p = (uintptr)v>>PageShift;
-		if(sizeof(void*) == 8)
-			p -= (uintptr)runtime_mheap.arena_start >> PageShift;
+		p -= (uintptr)runtime_mheap.arena_start >> PageShift;
 		s = runtime_mheap.spans[p];
 
 		if(s->sizeclass == 0) {
diff --git a/libgo/runtime/mgc0.c b/libgo/runtime/mgc0.c
index 865f19304892..8ceece37b5af 100644
--- a/libgo/runtime/mgc0.c
+++ b/libgo/runtime/mgc0.c
@@ -269,8 +269,7 @@ markonly(void *obj)
 	// (Manually inlined copy of MHeap_LookupMaybe.)
 	k = (uintptr)obj>>PageShift;
 	x = k;
-	if(sizeof(void*) == 8)
-		x -= (uintptr)runtime_mheap.arena_start>>PageShift;
+	x -= (uintptr)runtime_mheap.arena_start>>PageShift;
 	s = runtime_mheap.spans[x];
 	if(s == nil || k < s->start || (byte*)obj >= s->limit || s->state != MSpanInUse)
 		return false;
@@ -453,8 +452,7 @@ flushptrbuf(PtrTarget *ptrbuf, PtrTarget **ptrbufpos, Obj **_wp, Workbuf **_wbuf
 			// (Manually inlined copy of MHeap_LookupMaybe.)
 			k = (uintptr)obj>>PageShift;
 			x = k;
-			if(sizeof(void*) == 8)
-				x -= (uintptr)arena_start>>PageShift;
+			x -= (uintptr)arena_start>>PageShift;
 			s = runtime_mheap.spans[x];
 			if(s == nil || k < s->start || obj >= s->limit || s->state != MSpanInUse)
 				continue;
@@ -501,8 +499,7 @@ flushptrbuf(PtrTarget *ptrbuf, PtrTarget **ptrbufpos, Obj **_wp, Workbuf **_wbuf
 			// Ask span about size class.
 			// (Manually inlined copy of MHeap_Lookup.)
 			x = (uintptr)obj >> PageShift;
-			if(sizeof(void*) == 8)
-				x -= (uintptr)arena_start>>PageShift;
+			x -= (uintptr)arena_start>>PageShift;
 			s = runtime_mheap.spans[x];
 
 			PREFETCH(obj);
@@ -617,8 +614,7 @@ checkptr(void *obj, uintptr objti)
 	if(t == nil)
 		return;
 	x = (uintptr)obj >> PageShift;
-	if(sizeof(void*) == 8)
-		x -= (uintptr)(runtime_mheap.arena_start)>>PageShift;
+	x -= (uintptr)(runtime_mheap.arena_start)>>PageShift;
 	s = runtime_mheap.spans[x];
 	objstart = (byte*)((uintptr)s->start<<PageShift);
 	if(s->sizeclass != 0) {
diff --git a/libgo/runtime/mheap.c b/libgo/runtime/mheap.c
index 62070f37943f..fee493c1367f 100644
--- a/libgo/runtime/mheap.c
+++ b/libgo/runtime/mheap.c
@@ -73,8 +73,7 @@ runtime_MHeap_MapSpans(MHeap *h)
 
 	// Map spans array, PageSize at a time.
 	n = (uintptr)h->arena_used;
-	if(sizeof(void*) == 8)
-		n -= (uintptr)h->arena_start;
+	n -= (uintptr)h->arena_start;
 	n = n / PageSize * sizeof(h->spans[0]);
 	n = ROUND(n, PageSize);
 	pagesize = getpagesize();
@@ -170,8 +169,7 @@ HaveSpan:
 		runtime_MSpan_Init(t, s->start + npage, s->npages - npage);
 		s->npages = npage;
 		p = t->start;
-		if(sizeof(void*) == 8)
-			p -= ((uintptr)h->arena_start>>PageShift);
+		p -= ((uintptr)h->arena_start>>PageShift);
 		if(p > 0)
 			h->spans[p-1] = s;
 		h->spans[p] = t;
@@ -189,8 +187,7 @@ HaveSpan:
 	s->elemsize = (sizeclass==0 ? s->npages<<PageShift : (uintptr)runtime_class_to_size[sizeclass]);
 	s->types.compression = MTypes_Empty;
 	p = s->start;
-	if(sizeof(void*) == 8)
-		p -= ((uintptr)h->arena_start>>PageShift);
+	p -= ((uintptr)h->arena_start>>PageShift);
 	for(n=0; n<npage; n++)
 		h->spans[p+n] = s;
 	return s;
@@ -258,8 +255,7 @@ MHeap_Grow(MHeap *h, uintptr npage)
 	s = runtime_FixAlloc_Alloc(&h->spanalloc);
 	runtime_MSpan_Init(s, (uintptr)v>>PageShift, ask>>PageShift);
 	p = s->start;
-	if(sizeof(void*) == 8)
-		p -= ((uintptr)h->arena_start>>PageShift);
+	p -= ((uintptr)h->arena_start>>PageShift);
 	h->spans[p] = s;
 	h->spans[p + s->npages - 1] = s;
 	s->state = MSpanInUse;
@@ -276,8 +272,7 @@ runtime_MHeap_Lookup(MHeap *h, void *v)
 	uintptr p;
 	
 	p = (uintptr)v;
-	if(sizeof(void*) == 8)
-		p -= (uintptr)h->arena_start;
+	p -= (uintptr)h->arena_start;
 	return h->spans[p >> PageShift];
 }
 
@@ -298,8 +293,7 @@ runtime_MHeap_LookupMaybe(MHeap *h, void *v)
 		return nil;
 	p = (uintptr)v>>PageShift;
 	q = p;
-	if(sizeof(void*) == 8)
-		q -= (uintptr)h->arena_start >> PageShift;
+	q -= (uintptr)h->arena_start >> PageShift;
 	s = h->spans[q];
 	if(s == nil || p < s->start || (byte*)v >= s->limit || s->state != MSpanInUse)
 		return nil;
@@ -346,8 +340,7 @@ MHeap_FreeLocked(MHeap *h, MSpan *s)
 
 	// Coalesce with earlier, later spans.
 	p = s->start;
-	if(sizeof(void*) == 8)
-		p -= (uintptr)h->arena_start >> PageShift;
+	p -= (uintptr)h->arena_start >> PageShift;
 	if(p > 0 && (t = h->spans[p-1]) != nil && t->state != MSpanInUse) {
 		if(t->npreleased == 0) {  // cant't touch this otherwise
 			tp = (uintptr*)(t->start<<PageShift);