diff --git a/src/macros/generate/convert/auxiliary/c/identifier/mod.rs b/src/macros/generate/convert/auxiliary/c/identifier/mod.rs
index c3844a5..a48de27 100644
--- a/src/macros/generate/convert/auxiliary/c/identifier/mod.rs
+++ b/src/macros/generate/convert/auxiliary/c/identifier/mod.rs
@@ -52,6 +52,23 @@ impl Identifier {
                         const char*
                     }
                 }
+                // Unsigned
+                "u_8" => quote! { uint8_t },
+                "u_16" => quote! { uint16_t },
+                "u_32" => quote! { uint32_t },
+                "u_64" => quote! { uint64_t },
+                // Signed
+                "i_8" => quote! { int8_t },
+                "i_16" => quote! { int16_t },
+                "i_32" => quote! { int32_t },
+                "i_64" => quote! { int64_t },
+                // Float
+                "f_32" => quote! { float },
+                "f_64" => quote! { double },
+                // Other (not yet imlemented)
+                // ("Option", 1),
+                // ("Vec", 1),
+                // ("Result", 2),
                 other => {
                     todo!("'{}' is not yet supported", other)
                 }
diff --git a/src/macros/generate/convert/host/rust/type/mod.rs b/src/macros/generate/convert/host/rust/type/mod.rs
index bf5f9b4..6c274c1 100644
--- a/src/macros/generate/convert/host/rust/type/mod.rs
+++ b/src/macros/generate/convert/host/rust/type/mod.rs
@@ -42,7 +42,11 @@ impl Type {
         }
     }
     pub fn to_rust_function(inputs: &[NamedType], output: &Option<Box<Type>>) -> TokenStream2 {
-        let inputs: Vec<TokenStream2> = inputs.iter().map(NamedType::to_rust).collect();
+        let inputs: Vec<TokenStream2> = inputs
+            .iter()
+            .map(|r#type| &r#type.r#type)
+            .map(Type::to_rust)
+            .collect();
         let output = if let Some(output) = output {
             let output = output.to_rust();
             quote! {
diff --git a/tests/functions/expected.md b/tests/functions/expected.md
index e69de29..aa97a82 100644
--- a/tests/functions/expected.md
+++ b/tests/functions/expected.md
@@ -0,0 +1,74 @@
+# Host files
+
+File path: `out/dir/api.rs`
+
+```rust
+// Host code
+/* Rust API */
+#[derive(Debug)]
+pub enum Commands {
+    /// Call out an outstanding person
+    #[allow(non_camel_case_types)]
+    call_me_back_outstanding { callback: fn(String) -> String },
+    One(one::One),
+}
+pub mod one {
+    #[derive(Debug)]
+    pub enum One {
+        /// Call out a person
+        #[allow(non_camel_case_types)]
+        call_me_back { callback: fn(u32) },
+    }
+}
+/* C API */
+#[no_mangle]
+pub extern "C" fn call_me_back_outstanding(
+    callback: fn(String) -> String,
+) -> core::ffi::c_int {
+    callback_function(call_me_back_outstanding);
+    return 1;
+}
+pub mod one_c {}
+#[no_mangle]
+pub extern "C" fn one_call_me_back(callback: fn(u32)) -> core::ffi::c_int {
+    callback_function(one_call_me_back);
+    return 1;
+}
+// vim: filetype=rust
+```
+
+# Auxiliary files
+
+File path: `dist/interface.h`
+
+```c
+#if !defined TRIXY_MAIN_HEADER
+#define TRIXY_MAIN_HEADER
+
+#include "errno.h"
+#include "string.h"
+#include "vec.h"
+
+/**
+  Call out an outstanding person
+*/
+extern int
+call_me_back_outstanding (const char *(*name) (const char *name)callback);
+
+/**
+  Call out a person
+*/
+extern int one_call_me_back (void (*name) (uint32_t age) callback);
+
+struct one
+{
+  int (*call_me_back) ();
+};
+
+const struct one one = {
+  .call_me_back = one_call_me_back,
+};
+
+#endif // if !defined TRIXY_MAIN_HEADER
+// vim: filetype=c
+```