diff --git a/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp b/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
index 6977fde7e0ebd..be46d7ac3086d 100644
--- a/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
+++ b/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
@@ -703,7 +703,7 @@ void G1ConcurrentMark::clear_next_bitmap(WorkerThreads* workers, bool may_yield)
 
   log_debug(gc, ergo)("Running %s with %u workers for " SIZE_FORMAT " work units.", cl.name(), num_workers, num_chunks);
   workers->run_task(&cl, num_workers);
-  guarantee(!may_yield || cl.is_complete(), "Must have completed iteration when not yielding.");
+  guarantee(may_yield || cl.is_complete(), "Must have completed iteration when not yielding.");
 }
 
 void G1ConcurrentMark::cleanup_for_next_mark() {