diff --git a/src/searcher.rs b/src/searcher.rs
index aa4a16d..74ebfa2 100644
--- a/src/searcher.rs
+++ b/src/searcher.rs
@@ -153,7 +153,7 @@ pub struct ClosureSearcher {
     /// Closures must return an `rlua::Result`-wrapped `Function`. This `Function`
     /// acts as the module loader.
     modules: HashMap<
-        &'static str,
+        String,
         Box<
             dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>
                 + Send,
@@ -166,7 +166,7 @@ pub struct ClosureSearcher {
 impl ClosureSearcher {
     pub fn new(
         modules: HashMap<
-            &'static str,
+            String,
             Box<
                 dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>
                     + Send,
@@ -232,7 +232,7 @@ pub trait AddSearcher {
     fn add_closure_searcher(
         &self,
         modules: HashMap<
-            &'static str,
+            String,
             Box<
                 dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>
                     + Send,
@@ -297,7 +297,7 @@ impl<'a> AddSearcher for Context<'a> {
     fn add_closure_searcher(
         &self,
         modules: HashMap<
-            &'static str,
+            String,
             Box<
                 dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>
                     + Send,
diff --git a/tests/tests.rs b/tests/tests.rs
index 2d3457d..c2f352b 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -165,7 +165,7 @@ fn add_closure_searcher_works() {
     let lua = Lua::new();
 
     let mut modules: HashMap<
-        &'static str,
+        String,
         Box<
             dyn for<'ctx> Fn(Context<'ctx>, Table<'ctx>, &str) -> rlua::Result<Function<'ctx>>
                 + Send,
@@ -189,7 +189,7 @@ fn add_closure_searcher_works() {
             .into_function()?)
     });
 
-    modules.insert("instrument", instrument_loader);
+    modules.insert("instrument".to_string(), instrument_loader);
 
     let sound = lua
         .context::<_, Result<String>>(|lua_ctx| {