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-rw-r--r--malloc/arena.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/malloc/arena.c b/malloc/arena.c
index 6f4b0c497b..2179174d64 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -712,7 +712,7 @@ grow_heap(h, diff) heap_info *h; long diff;
   if(diff >= 0) {
     diff = (diff + page_mask) & ~page_mask;
     new_size = (long)h->size + diff;
-    if(new_size > HEAP_MAX_SIZE)
+    if((unsigned long) new_size > (unsigned long) HEAP_MAX_SIZE)
       return -1;
     if(mprotect((char *)h + h->size, diff, PROT_READ|PROT_WRITE) != 0)
       return -2;