diff --git a/src/interpreter/instructions/argument_get.rs b/src/interpreter/instructions/argument_get.rs
index 8819302..0a67909 100644
--- a/src/interpreter/instructions/argument_get.rs
+++ b/src/interpreter/instructions/argument_get.rs
@@ -1,6 +1,6 @@
 executable_instruction!(
     argument_get(index: u64, instruction_name: String) -> _ {
-        Box::new(move |runtime| -> _ {
+        move |runtime| -> _ {
             let invocation_inputs = runtime.invocation_inputs;
 
             if index >= (invocation_inputs.len() as u64) {
@@ -13,7 +13,7 @@ executable_instruction!(
             runtime.stack.push(invocation_inputs[index as usize].clone());
 
             Ok(())
-        })
+        }
     }
 );
 
diff --git a/src/interpreter/instructions/call.rs b/src/interpreter/instructions/call.rs
index 4a74655..d58368c 100644
--- a/src/interpreter/instructions/call.rs
+++ b/src/interpreter/instructions/call.rs
@@ -5,7 +5,7 @@ use crate::interpreter::wasm::{
 
 executable_instruction!(
     call(function_index: usize, instruction_name: String) -> _ {
-        Box::new(move |runtime| -> _ {
+        move |runtime| -> _ {
             let instance = runtime.wasm_instance;
             let index = FunctionIndex::new(function_index);
 
@@ -58,7 +58,7 @@ executable_instruction!(
                     function_index,
                 ))
             }
-        })
+        }
     }
 );
 
diff --git a/src/interpreter/instructions/call_export.rs b/src/interpreter/instructions/call_export.rs
index 05de647..a1a4340 100644
--- a/src/interpreter/instructions/call_export.rs
+++ b/src/interpreter/instructions/call_export.rs
@@ -2,7 +2,7 @@ use crate::interpreter::wasm::values::InterfaceType;
 
 executable_instruction!(
     call_export(export_name: String, instruction_name: String) -> _ {
-        Box::new(move |runtime| -> _ {
+        move |runtime| -> _ {
             let instance = runtime.wasm_instance;
 
             match instance.export(&export_name) {
@@ -54,7 +54,7 @@ executable_instruction!(
                     export_name,
                 ))
             }
-        })
+        }
     }
 );
 
diff --git a/src/interpreter/instructions/read_utf8.rs b/src/interpreter/instructions/read_utf8.rs
index 8f195fd..55fe350 100644
--- a/src/interpreter/instructions/read_utf8.rs
+++ b/src/interpreter/instructions/read_utf8.rs
@@ -3,7 +3,7 @@ use std::{cell::Cell, convert::TryFrom};
 
 executable_instruction!(
     read_utf8(instruction_name: String) -> _ {
-        Box::new(move |runtime| -> _ {
+        move |runtime| -> _ {
             match runtime.stack.pop(2) {
                 Some(inputs) => match runtime.wasm_instance.memory(0) {
                     Some(memory) => {
@@ -48,7 +48,7 @@ executable_instruction!(
                     instruction_name,
                 ))
             }
-        })
+        }
     }
 );
 
diff --git a/src/interpreter/instructions/write_utf8.rs b/src/interpreter/instructions/write_utf8.rs
index fa66621..34e148f 100644
--- a/src/interpreter/instructions/write_utf8.rs
+++ b/src/interpreter/instructions/write_utf8.rs
@@ -3,7 +3,7 @@ use std::convert::TryInto;
 
 executable_instruction!(
     write_utf8(allocator_name: String, instruction_name: String) -> _ {
-        Box::new(move |runtime| -> _ {
+        move |runtime| -> _ {
             let instance = runtime.wasm_instance;
 
             match instance.export(&allocator_name) {
@@ -67,7 +67,7 @@ executable_instruction!(
                     allocator_name
                 ))
             }
-        })
+        }
     }
 );
 
diff --git a/src/macros.rs b/src/macros.rs
index e6c0abf..2d2e146 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -37,7 +37,7 @@ macro_rules! executable_instruction {
             Memory: wasm::structures::Memory,
             Instance: wasm::structures::Instance<Export, LocalImport, Memory>,
         {
-            $implementation
+            Box::new($implementation)
         }
     };
 }