diff --git a/src/which.zig b/src/which.zig
index 3295877f2fd7f9..5aaaa8cd0f97e8 100644
--- a/src/which.zig
+++ b/src/which.zig
@@ -79,7 +79,7 @@ pub fn endsWithExtension(str: []const u8) bool {
     const file_ext = str[str.len - 3 ..];
     inline for (win_extensions) |ext| {
         comptime bun.assert(ext.len == 3);
-        if (bun.strings.eqlComptimeCheckLenWithType(u8, file_ext, ext, false)) return true;
+        if (bun.strings.eqlCaseInsensitiveASCIIICheckLength(file_ext, ext)) return true;
     }
     return false;
 }
diff --git a/test/js/bun/util/which.test.ts b/test/js/bun/util/which.test.ts
index ffd02386a31fab..edb4670e32a2b8 100644
--- a/test/js/bun/util/which.test.ts
+++ b/test/js/bun/util/which.test.ts
@@ -33,6 +33,7 @@ if (isWindows) {
   test("which", () => {
     expect(which("cmd")).toBe("C:\\Windows\\system32\\cmd.exe");
     expect(which("cmd.exe")).toBe("C:\\Windows\\system32\\cmd.exe");
+    expect(which("cmd.EXE")).toBe("C:\\Windows\\system32\\cmd.EXE");
     expect(which("cmd.bat")).toBe(null);
     const exe = basename(process.execPath);
     const dir = join(process.execPath, "../");