diff --git a/src/lib.rs b/src/lib.rs
index 97bfe3e..307c7ad 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -34,7 +34,7 @@ pub use runtime_type::inject_runtime_type;
 pub struct TargetSymbols {
     pub create: &'static str,
     pub call: &'static str,
-    pub return_: &'static str,
+    pub ret: &'static str,
 }
 
 pub enum TargetRuntime {
@@ -48,7 +48,7 @@ impl TargetRuntime {
         TargetRuntime::Substrate(TargetSymbols {
             create: "deploy",
             call: "call",
-            return_: "ext_return",
+            ret: "ext_return",
         })
     }
 
@@ -56,7 +56,7 @@ impl TargetRuntime {
         TargetRuntime::PWasm(TargetSymbols {
             create: "deploy",
             call: "call",
-            return_: "ret",
+            ret: "ret",
         })
     }
 
diff --git a/src/pack.rs b/src/pack.rs
index 4a148f8..8563178 100644
--- a/src/pack.rs
+++ b/src/pack.rs
@@ -87,7 +87,7 @@ pub fn pack_instance(raw_module: Vec<u8>, mut ctor_module: elements::Module, tar
         let mut found = false;
         for entry in ctor_module.import_section().ok_or(Error::NoImportSection)?.entries().iter() {
             if let External::Function(_) = *entry.external() {
-                if entry.field() == target.symbols().return_ { found = true; break; }
+                if entry.field() == target.symbols().ret { found = true; break; }
                 else { id += 1; }
             }
         }
@@ -102,7 +102,7 @@ pub fn pack_instance(raw_module: Vec<u8>, mut ctor_module: elements::Module, tar
             mbuilder.push_import(
                 builder::import()
                     .module("env")
-                    .field(&target.symbols().return_)
+                    .field(&target.symbols().ret)
                     .external().func(import_sig)
                     .build()
                 );