diff --git a/js/src/jit/IonAnalysis.cpp b/js/src/jit/IonAnalysis.cpp
index 0fe5b38f8..bc889ad95 100644
--- a/js/src/jit/IonAnalysis.cpp
+++ b/js/src/jit/IonAnalysis.cpp
@@ -1999,7 +1999,7 @@ jit::RemoveUnmarkedBlocks(MIRGenerator* mir, MIRGraph& graph, uint32_t numMarked
         // bailout.
         for (PostorderIterator it(graph.poBegin()); it != graph.poEnd();) {
             MBasicBlock* block = *it++;
-            if (!block->isMarked())
+            if (block->isMarked())
                 continue;
 
             FlagAllOperandsAsHavingRemovedUses(mir, block);