diff --git a/src/lib.rs b/src/lib.rs
index 90555ad..ef37600 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
 use proc_macro::TokenStream;
 use quote::quote;
-use syn::{parse_macro_input, ItemEnum, DeriveInput, Fields, Data};
+use syn::{parse_macro_input, Lit, ItemEnum, DeriveInput, Fields, Data};
 
 #[proc_macro_derive(HttpRequest, attributes(http_get))]
 pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
@@ -23,6 +23,7 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
         }
     }
     let base_url = base_url.expect("Missing #[http_get(url = \"...\")] attribute");
+    let base_url_lit = Lit::Str(syn::LitStr::new(&base_url, proc_macro2::Span::call_site()));
 
     let expanded = match &input.data {
         Data::Struct(data_struct) => {
@@ -47,7 +48,7 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
                 impl Queryable for #name {
                     fn send(
                         &self,
-                        base_url: &str,
+                        _base_url: &str, // not used
                         headers: Option<Vec<(&str, &str)>>,
                     ) -> Result<Response, std::io::Error> {
                         use urlencoding::encode;
@@ -56,7 +57,7 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
                         let mut query_params: Vec<(String, String)> = Vec::new();
                         #(#query_param_code)*
 
-                        let mut url = base_url.to_string();
+                        let mut url = #base_url_lit.to_string();
                         if !query_params.is_empty() {
                             let query_parts: Vec<String> = query_params.iter()
                                 .map(|(k, v)| format!("{}={}", k, encode(v)))
@@ -98,7 +99,7 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
                 match &variant.fields {
                     Fields::Unnamed(fields) if fields.unnamed.len() == 1 => {
                         variant_arms.push(quote! {
-                            #name::#vname(inner) => inner.send(base_url, headers.clone()),
+                            #name::#vname(inner) => inner.send(#base_url_lit, headers.clone()),
                         });
                     }
                     _ => panic!("#[derive(HttpRequest)] enum variants must have a single unnamed field"),
@@ -109,7 +110,7 @@ pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
                 impl Queryable for #name {
                     fn send(
                         &self,
-                        base_url: &str,
+                        _base_url: &str, // not used
                         headers: Option<Vec<(&str, &str)>>,
                     ) -> Result<Response, std::io::Error> {
                         match self {