diff --git a/packages/shims/src/index.js b/packages/shims/src/index.js
index 330683cf2b..2281298d7b 100644
--- a/packages/shims/src/index.js
+++ b/packages/shims/src/index.js
@@ -85,27 +85,25 @@
         var fr = new FileReader();
         try {
             fr.readAsArrayBuffer(new Blob([ "hello" ], { type: "text/plain" }));
-            return;
-        } catch (error) { }
-
-        shims.push("FileReader.prototype.readAsArrayBuffer");
-        FileReader.prototype.readAsArrayBuffer = function (blob) {
-            if (this.readyState === this.LOADING) throw new Error("InvalidStateError");
-            this._setReadyState(this.LOADING);
-            this._result = null;
-            this._error = null;
-            var fr = new FileReader();
-            fr.onloadend = () => {
-                var content = atob(fr.result.split(",").pop().trim());
-                var buffer = new ArrayBuffer(content.length);
-                var view = new Uint8Array(buffer);
-                view.set(Array.from(content).map(c => c.charCodeAt(0)));
-                this._result = buffer;
-                this._setReadyState(this.DONE);
-            };
-            fr.readAsDataURL(blob);
+        } catch (error) {
+            shims.push("FileReader.prototype.readAsArrayBuffer");
+            FileReader.prototype.readAsArrayBuffer = function (blob) {
+                if (this.readyState === this.LOADING) { throw new Error("InvalidStateError"); }
+                this._setReadyState(this.LOADING);
+                this._result = null;
+                this._error = null;
+                var fr = new FileReader();
+                fr.onloadend = () => {
+                    var content = atob(fr.result.split(",").pop().trim());
+                    var buffer = new ArrayBuffer(content.length);
+                    var view = new Uint8Array(buffer);
+                    view.set(Array.from(content).map(c => c.charCodeAt(0)));
+                    this._result = buffer;
+                    this._setReadyState(this.DONE);
+                };
+                fr.readAsDataURL(blob);
+            }
         }
-
     } catch (error) {
         console.log("Missing FileReader; unsupported platform");
     }