diff --git a/codegen/src/function.rs b/codegen/src/function.rs
index 4e5bf139..41b3aac1 100644
--- a/codegen/src/function.rs
+++ b/codegen/src/function.rs
@@ -113,6 +113,14 @@ impl Parse for ExportedFnParams {
             }
         }
 
+        // Check validity of name, if present.
+        if name.as_ref().filter(|n| n.contains('.')).is_some() {
+            return Err(syn::Error::new(
+                span,
+                "Rhai function names may not contain dot"
+            ))
+        }
+
         Ok(ExportedFnParams {
             name,
             return_raw,
diff --git a/codegen/ui_tests/rhai_fn_rename_dot.rs b/codegen/ui_tests/rhai_fn_rename_dot.rs
new file mode 100644
index 00000000..9e2180d9
--- /dev/null
+++ b/codegen/ui_tests/rhai_fn_rename_dot.rs
@@ -0,0 +1,28 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+pub struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_module]
+pub mod test_module {
+    pub use super::Point;
+    #[rhai_fn(name = "foo.bar")]
+    pub fn test_fn(input: Point) -> bool {
+        input.x > input.y
+    }
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_module::test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}
diff --git a/codegen/ui_tests/rhai_fn_rename_dot.stderr b/codegen/ui_tests/rhai_fn_rename_dot.stderr
new file mode 100644
index 00000000..f650a081
--- /dev/null
+++ b/codegen/ui_tests/rhai_fn_rename_dot.stderr
@@ -0,0 +1,11 @@
+error: Rhai function names may not contain dot
+  --> $DIR/rhai_fn_rename_dot.rs:12:15
+   |
+12 |     #[rhai_fn(name = "foo.bar")]
+   |               ^^^^^^^^^^^^^^^^
+
+error[E0433]: failed to resolve: use of undeclared type or module `test_module`
+  --> $DIR/rhai_fn_rename_dot.rs:23:8
+   |
+23 |     if test_module::test_fn(n) {
+   |        ^^^^^^^^^^^ use of undeclared type or module `test_module`