diff --git a/lib/stream.js b/lib/stream.js
index 012d6d0..97e4d94 100644
--- a/lib/stream.js
+++ b/lib/stream.js
@@ -1,14 +1,5 @@
 // Attempt to use readable-stream if available, attempt to use the built-in stream module.
-let Readable;
-try {
-  Readable = require("readable-stream").Readable;
-} catch (e) {
-  try {
-    Readable = require("stream").Readable;
-  } catch (e) {
-    Readable = null;
-  }
-}
+let Readable = null;
 
 /**
  * A server-sent event.
@@ -53,9 +44,21 @@ class Stream extends Readable {
    */
   constructor(url, options) {
     if (!Readable) {
-      throw new Error(
-        "Readable streams are not supported. Please use Node.js 18 or later, or install the readable-stream package."
-      );
+      try {
+        Readable = require("readable-stream").Readable;
+      } catch (e) {}
+
+      if (!Readable) {
+        try {
+          Readable = require("stream").Readable;
+        } catch (e) {}
+      }
+
+      if (!Readable) {
+        throw new Error(
+          "Readable streams are not supported. Please use Node.js 18 or later, or install the readable-stream package."
+        );
+      }
     }
 
     super();