diff --git a/packages/babel-plugin-inject-polyfills/src/index.js b/packages/babel-plugin-inject-polyfills/src/index.js
index 3ab900ff..180f61e2 100644
--- a/packages/babel-plugin-inject-polyfills/src/index.js
+++ b/packages/babel-plugin-inject-polyfills/src/index.js
@@ -201,7 +201,11 @@ export default declare((api, options: Options, dirname: string) => {
       const key = resolveKey(path.get("property"), path.node.computed);
       if (!key || key === "prototype") return;
 
-      const source = resolveSource(path.get("object"));
+      const object = path.get("object");
+      const binding = object.scope.getBinding(object.node.name);
+      if (binding && binding.path.isImportNamespaceSpecifier()) return;
+
+      const source = resolveSource(object);
       return property(source.id, key, source.placement, path);
     },
 
diff --git a/packages/babel-polyfill-provider-corejs3/src/index.js b/packages/babel-polyfill-provider-corejs3/src/index.js
index 1c54a1bf..34118a0b 100644
--- a/packages/babel-polyfill-provider-corejs3/src/index.js
+++ b/packages/babel-polyfill-provider-corejs3/src/index.js
@@ -119,15 +119,6 @@ export default ((
     },
 
     usagePure(meta, utils, path) {
-      const isNamespaced = path => {
-        if (!path.node) return false;
-        const binding = path.scope.getBinding(path.node.name);
-        if (!binding) return false;
-        return binding.path.isImportNamespaceSpecifier();
-      };
-
-      if (isNamespaced(path.get("object"))) return false;
-
       if (meta.kind === "in") {
         if (meta.key === "Symbol.iterator") {
           path.replaceWith(