diff --git a/RELEASES.md b/RELEASES.md
index 902cd855..cb155381 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -4,6 +4,12 @@ Rhai Release Notes
 Version 0.19.0
 ==============
 
+Bug fixes
+---------
+
+* `if` statement with an empty `true` block would not evaluate the `false` block.  This is now fixed.
+* Fixes a bug in `Module::set_fn_4_mut`.
+
 New features
 ------------
 
diff --git a/src/module.rs b/src/module.rs
index 3513dd7f..4d70b169 100644
--- a/src/module.rs
+++ b/src/module.rs
@@ -913,7 +913,7 @@ impl Module {
             TypeId::of::<A>(),
             TypeId::of::<B>(),
             TypeId::of::<C>(),
-            TypeId::of::<C>(),
+            TypeId::of::<D>(),
         ];
         self.set_fn(name, Public, &arg_types, Func::from_method(Box::new(f)))
     }
diff --git a/tests/modules.rs b/tests/modules.rs
index 06f5e37e..0744fd8c 100644
--- a/tests/modules.rs
+++ b/tests/modules.rs
@@ -78,6 +78,15 @@ fn test_module_resolver() -> Result<(), Box<EvalAltResult>> {
         Ok(())
     });
 
+    #[cfg(not(feature = "no_float"))]
+        module.set_fn_4_mut(
+        "sum_of_three_args".to_string(),
+        |target: &mut INT, a: INT, b: INT, c: f64| {
+            *target = a + b + c as INT;
+            Ok(())
+        }
+    );
+
     resolver.insert("hello", module);
 
     let mut engine = Engine::new();
@@ -130,6 +139,20 @@ fn test_module_resolver() -> Result<(), Box<EvalAltResult>> {
         )?,
         42
     );
+    #[cfg(not(feature = "no_float"))]
+    {
+        assert_eq!(
+            engine.eval::<INT>(
+                r#"
+                        import "hello" as h;
+                        let x = 21;
+                        h::sum_of_three_args(x, 14, 26, 2.0);
+                        x
+                    "#
+            )?,
+            42
+        );
+    }
 
     #[cfg(not(feature = "unchecked"))]
     {