diff --git a/main.go b/main.go
index 8642fee..c1b917a 100644
--- a/main.go
+++ b/main.go
@@ -187,7 +187,24 @@ func (t *Transport) RoundTrip(req *Request) (resp *Response, err error) {
 				resp.ContentLength = -1
 			}
 		}
-		resp.Body = jsStreams.NewReadableStream(args[0].Get("body"))
+
+		// Safari doesn't support readable streams
+		if strings.Contains(js.Global().Get("navigator").Get("userAgent").String(), "Safari") {
+			resp.Body = jsStreams.NewReadableStream(args[0].Get("body"))
+		} else {
+			// Read in the body with .arrayBuffer()
+			promise := args[0].Call("bytes")
+			var waitGroup sync.WaitGroup
+			waitGroup.Add(1)
+			promise.Call("then", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+				bytes := make([]byte, args[0].Get("length").Int())
+				js.CopyBytesToGo(bytes, args[0])
+				waitGroup.Done()
+				return nil
+			}))
+
+			waitGroup.Wait()
+		}
 
 		// Standard-library compatibility fields
 		resp.Proto = "HTTP/1.1"