--- a/js/src/vm/RegExpStatics.h
+++ b/js/src/vm/RegExpStatics.h
@@ -386,16 +386,17 @@ RegExpStatics::updateFromMatchPairs(JSCo
 inline void
 RegExpStatics::clear()
 {
     matches.forgetArray();
     matchesInput = nullptr;
     lazySource = nullptr;
     lazyFlags = RegExpFlag(0);
     lazyIndex = size_t(-1);
+    lazySticky = false;
     pendingInput = nullptr;
     flags = RegExpFlag(0);
     pendingLazyEvaluation = false;
 }
 
 inline void
 RegExpStatics::setPendingInput(JSString* newInput)
 {