diff --git a/lib/runtime/examples/simple/main.rs b/lib/runtime/examples/simple/main.rs
index ddb4b5d72..1aeb9aef6 100644
--- a/lib/runtime/examples/simple/main.rs
+++ b/lib/runtime/examples/simple/main.rs
@@ -12,8 +12,8 @@ fn main() -> Result<(), String> {
 
     let mut imports = Imports::new();
     imports.add(
-        "env".to_string(),
-        "print_num".to_string(),
+        "env",
+        "print_num",
         Import::Func(
             unsafe { FuncRef::new(print_num as _) },
             FuncSig {
diff --git a/lib/runtime/src/instance.rs b/lib/runtime/src/instance.rs
index 5f50309e7..dd8fa0ebf 100644
--- a/lib/runtime/src/instance.rs
+++ b/lib/runtime/src/instance.rs
@@ -169,11 +169,11 @@ impl Imports {
         }
     }
 
-    pub fn add(&mut self, module: String, name: String, import: Import) {
+    pub fn add(&mut self, module: impl Into<String>, name: impl Into<String>, import: Import) {
         self.map
-            .entry(module)
-            .or_insert(HashMap::new())
-            .insert(name, import);
+            .entry(module.into())
+            .or_insert_with(|| HashMap::new())
+            .insert(name.into(), import);
     }
 
     pub fn get(&self, module: &str, name: &str) -> Option<&Import> {