diff --git a/src/share/vm/gc_implementation/g1/heapRegionSet.cpp b/src/share/vm/gc_implementation/g1/heapRegionSet.cpp
index 9ffb46f83d670285eaf601df5fd4b5ea540bb898..213380e767d1443a37f9804e76bb147c6e247049 100644
--- a/src/share/vm/gc_implementation/g1/heapRegionSet.cpp
+++ b/src/share/vm/gc_implementation/g1/heapRegionSet.cpp
@@ -231,7 +231,7 @@ void FreeRegionList::remove_starting_at(HeapRegion* first, uint num_regions) {
       assert(_tail != curr, hrs_ext_msg(this, "invariant"));
       next->set_prev(prev);
     }
-    if (_last = curr) {
+    if (_last == curr) {
       _last = NULL;
     }