2 files changed, 16 insertions, 2 deletions
diff --git a/ext/node/02_require.js b/ext/node/02_require.js
index db4329911..b5117042d 100644
--- a/ext/node/02_require.js
+++ b/ext/node/02_require.js
@@ -826,6 +826,17 @@
     return require;
   }
 
+  // Matches to:
+  // - /foo/...
+  // - \foo\...
+  // - C:/foo/...
+  // - C:\foo\...
+  const RE_START_OF_ABS_PATH = /^([/\\]|[a-zA-Z]:[/\\])/;
+
+  function isAbsolute(filenameOrUrl) {
+    return RE_START_OF_ABS_PATH.test(filenameOrUrl);
+  }
+
   function createRequire(filenameOrUrl) {
     let fileUrlStr;
     if (filenameOrUrl instanceof URL) {
@@ -836,7 +847,7 @@
       }
       fileUrlStr = filenameOrUrl.toString();
     } else if (typeof filenameOrUrl === "string") {
-      if (!filenameOrUrl.startsWith("file:")) {
+      if (!filenameOrUrl.startsWith("file:") && !isAbsolute(filenameOrUrl)) {
         throw new Error(
           `The argument 'filename' must be a file URL object, file URL string, or absolute path string. Received ${filenameOrUrl}`,
         );
diff --git a/ext/node/lib.rs b/ext/node/lib.rs
index 0e84cea7b..c365d5d7b 100644
--- a/ext/node/lib.rs
+++ b/ext/node/lib.rs
@@ -245,7 +245,10 @@ where
 fn op_require_proxy_path(filename: String) -> String {
   // Allow a directory to be passed as the filename
   let trailing_slash = if cfg!(windows) {
-    filename.ends_with('\\')
+    // Node also counts a trailing forward slash as a
+    // directory for node on Windows, but not backslashes
+    // on non-Windows platforms
+    filename.ends_with('\\') || filename.ends_with('/')
   } else {
     filename.ends_with('/')
   };