diff --git a/src/apis/emscripten/syscalls.rs b/src/apis/emscripten/syscalls.rs
index 8ada6854d..51106b926 100644
--- a/src/apis/emscripten/syscalls.rs
+++ b/src/apis/emscripten/syscalls.rs
@@ -595,7 +595,7 @@ pub extern "C" fn ___syscall145(
             ret = ret + curr;
         }
         // debug!(" => ret: {}", ret);
-        return ret
+        ret
     }
 }
 
@@ -631,7 +631,7 @@ pub extern "C" fn ___syscall146(
             ret = ret + curr;
         }
         // debug!(" => ret: {}", ret);
-        return ret
+        ret
     }
 }
 
diff --git a/src/apis/emscripten/utils.rs b/src/apis/emscripten/utils.rs
index c0f4e02ab..ba5277c60 100644
--- a/src/apis/emscripten/utils.rs
+++ b/src/apis/emscripten/utils.rs
@@ -14,7 +14,7 @@ pub fn is_emscripten_module(module: &Module) -> bool {
             return true;
         }
     }
-    return false;
+    false
 }
 
 pub unsafe fn copy_cstr_into_wasm(instance: &mut Instance, cstr: *const c_char) -> u32 {
diff --git a/src/webassembly/instance.rs b/src/webassembly/instance.rs
index 405345d0e..301125513 100644
--- a/src/webassembly/instance.rs
+++ b/src/webassembly/instance.rs
@@ -45,7 +45,7 @@ pub fn protect_codebuf(code_buf: &Vec<u8>) -> Result<(), String> {
         )
     } {
         Err(err) => {
-            return Err(format!(
+            Err(format!(
                 "failed to give executable permission to code: {}",
                 err
             ))
@@ -147,7 +147,7 @@ pub struct InstanceOptions {
 
 extern "C" fn mock_fn() -> i32 {
     debug!("CALLING MOCKED FUNC");
-    return 0;
+    0
 }
 
 #[allow(dead_code)]