diff --git a/Cargo.toml b/Cargo.toml
index f940577..ec259cf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ keywords = ["handlebars", "tera", "fluent", "internationalization", "localizatio
 categories = ["internationalization", "localization", "template-engine"]
 
 [workspace.dependencies]
-unic-langid = "0.9"
+unic-langid = { version = "0.9", features = ["macros"] }
 ignore = "0.4"
 flume = { version = "0.11", default-features = false }
 once_cell = "1.19"
diff --git a/macros/src/lib.rs b/macros/src/lib.rs
index fee750c..2519266 100644
--- a/macros/src/lib.rs
+++ b/macros/src/lib.rs
@@ -208,11 +208,24 @@ pub fn static_loader(input: proc_macro::TokenStream) -> proc_macro::TokenStream
         quote!(None)
     };
 
+    let fallback_language_value = fallback_language.value();
+    if !fallback_language_value.parse::<unic_langid::LanguageIdentifier>().is_ok() {
+        return syn::Error::new(
+            fallback_language.span(),
+            format!(
+                "Invalid language identifier \"{}\" for fallback language",
+                &fallback_language_value
+            ),
+        )
+        .to_compile_error()
+        .into();
+    }
+
     let mut insert_resources: Vec<_> = build_resources(locales_directory).into_iter().collect();
 
     if !insert_resources
         .iter()
-        .any(|(lang, _)| *lang == fallback_language.value())
+        .any(|(lang, _)| *lang == fallback_language_value)
     {
         return syn::Error::new(
             fallback_language.span(),
@@ -271,18 +284,16 @@ pub fn static_loader(input: proc_macro::TokenStream) -> proc_macro::TokenStream
                     )
                 });
 
-            static LOCALES:
-                #LAZY<Vec<#LANGUAGE_IDENTIFIER>> =
-                #LAZY::new(|| RESOURCES.keys().cloned().collect());
-
             static FALLBACKS:
                 #LAZY<#HASHMAP<#LANGUAGE_IDENTIFIER, Vec<#LANGUAGE_IDENTIFIER>>> =
-                #LAZY::new(|| #CRATE_NAME::loader::build_fallbacks(&*LOCALES));
+                #LAZY::new(|| #CRATE_NAME::loader::build_fallbacks(
+                    &RESOURCES.keys().cloned().collect::<Vec<#LANGUAGE_IDENTIFIER>>()
+                ));
 
             #CRATE_NAME::StaticLoader::new(
                 &BUNDLES,
                 &FALLBACKS,
-                #fallback_language.parse().expect("invalid fallback language")
+                #CRATE_NAME::langid!(#fallback_language_value)
             )
         });
     };
diff --git a/src/lib.rs b/src/lib.rs
index 03fd3d5..50013ed 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -334,6 +334,8 @@ pub mod loader;
 #[cfg(feature = "macros")]
 pub use fluent_template_macros::static_loader;
 pub use unic_langid::LanguageIdentifier;
+#[cfg(feature = "macros")]
+pub use unic_langid::langid;
 
 #[doc(hidden)]
 pub use once_cell;