diff --git a/README.md b/README.md
index 926bbd66..b9d58d17 100644
--- a/README.md
+++ b/README.md
@@ -107,6 +107,8 @@ dotnet restore
 ```
 ### Generate bindings
 Generate the binding code. Bindings are generated with [Bindgen.NET](https://github.com/BeanCheeseBurrito/Bindgen.NET).
+> **Note**
+> The binding generator needs access to system headers on MacOS. Ensure that XCode is installed.
 ```console
 dotnet run --project src/Flecs.NET.Bindgen
 ```
diff --git a/src/Flecs.NET.Bindgen/Program.cs b/src/Flecs.NET.Bindgen/Program.cs
index cc0b1db4..f6995952 100644
--- a/src/Flecs.NET.Bindgen/Program.cs
+++ b/src/Flecs.NET.Bindgen/Program.cs
@@ -62,7 +62,7 @@ string GetMacOsHeaders()
 
     string path = process.StandardOutput.ReadToEnd().Trim();
 
-    if (!Path.Exists(path))
+    if (!Directory.Exists(path))
         throw new DirectoryNotFoundException("Couldn't find system headers. Install XCode.");
 
     return path + "/usr/include";