diff --git a/js/src/frontend/Parser.cpp b/js/src/frontend/Parser.cpp
index 738c7c6b1b2..b134d672ca0 100644
--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -6292,7 +6292,10 @@ Parser<ParseHandler>::assignExpr(InvokedPrediction invoked)
     if (!checkAndMarkAsAssignmentLhs(lhs, flavor))
         return null();
 
+    bool saved = pc->inDeclDestructuring;
+    pc->inDeclDestructuring = false;
     Node rhs = assignExpr();
+    pc->inDeclDestructuring = saved;
     if (!rhs)
         return null();
 
diff --git a/js/src/jit-test/tests/arguments/destructuring-default-value-scope.js b/js/src/jit-test/tests/arguments/destructuring-default-value-scope.js
new file mode 100644
index 00000000000..c4b16ea4dfe
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/destructuring-default-value-scope.js
@@ -0,0 +1,10 @@
+var a = 10;
+function f1(a,
+            [b=(assertEq(a, 1), a=2, 42)],
+            {c:c=(assertEq(a, 2), a=3, 43)}) {
+  assertEq(a, 3);
+  assertEq(b, 42);
+  assertEq(c, 43);
+}
+f1(1, [], {});
+assertEq(a, 10);