diff --git a/proxmox-api-macro/src/api_macro.rs b/proxmox-api-macro/src/api_macro.rs
index 5b37cba8..53aef87d 100644
--- a/proxmox-api-macro/src/api_macro.rs
+++ b/proxmox-api-macro/src/api_macro.rs
@@ -80,6 +80,13 @@ fn handle_function(
         .transpose()?
         .map_or_else(|| quote! { ::hyper::Body }, |v| v.into_token_stream());
 
+    let mut parameters = definition
+        .remove("parameters")
+        .map(|v| v.expect_object())
+        .transpose()?
+        .unwrap_or_else(HashMap::new);
+    let mut parameter_tokens = TokenStream::new();
+
     let vis = std::mem::replace(&mut item.vis, syn::Visibility::Inherited);
     let span = item.ident.span();
     let name_str = item.ident.to_string();
@@ -124,6 +131,21 @@ fn handle_function(
                     .unwrap_or(::serde_json::Value::Null)
             )?;
         });
+
+        let _info = parameters
+            .remove(&name_str)
+            .ok_or_else(|| format_err!("missing parameter '{}' in api defintion", name_str))?;
+    }
+
+    if !parameters.is_empty() {
+        let mut list = String::new();
+        for param in parameters.keys() {
+            if !list.is_empty() {
+                list.push_str(", ");
+            }
+            list.push_str(&param);
+        }
+        bail!("api definition contains parameters not found in function declaration: {}", list);
     }
 
     use std::iter::FromIterator;
diff --git a/proxmox-api-macro/tests/basic.rs b/proxmox-api-macro/tests/basic.rs
index d1af1ae0..0d578af4 100644
--- a/proxmox-api-macro/tests/basic.rs
+++ b/proxmox-api-macro/tests/basic.rs
@@ -55,7 +55,7 @@ async fn test_body() -> Result<&'static str, Error> {
     body: Bytes,
     description: "Loopback the `input` parameter",
     parameters: {
-        input: "the input",
+        param: "the input",
     },
 })]
 async fn get_loopback(param: String) -> Result<String, Error> {
@@ -66,7 +66,7 @@ async fn get_loopback(param: String) -> Result<String, Error> {
     body: Bytes,
     description: "Loopback the `input` parameter",
     parameters: {
-        input: "the input",
+        param: "the input",
     },
     returns: String
 })]