diff --git a/.changes/fix-win-dangling.md b/.changes/fix-win-dangling.md
new file mode 100644
index 00000000..12c20398
--- /dev/null
+++ b/.changes/fix-win-dangling.md
@@ -0,0 +1,5 @@
+---
+"tauri-plugin-single-instance": patch
+---
+
+fix dangling pointers caused by passing `encode_wide().as_ptr()` directly to FFI on Windows.
\ No newline at end of file
diff --git a/src/platform_impl/windows.rs b/src/platform_impl/windows.rs
index 3abec84c..3c92695e 100644
--- a/src/platform_impl/windows.rs
+++ b/src/platform_impl/windows.rs
@@ -33,12 +33,13 @@ pub fn init<R: Runtime>(f: Box<SingleInstanceCallback<R>>) -> TauriPlugin<R> {
 
             let class_name = encode_wide(format!("{}-sic", id));
             let window_name = encode_wide(format!("{}-siw", id));
+            let mutex_name = encode_wide(format!("{}-sim", id));
 
             let hmutex = unsafe {
                 CreateMutexW(
                     std::ptr::null(),
                     true.into(),
-                    encode_wide(format!("{}-sim", id)).as_ptr(),
+                    mutex_name.as_ptr(),
                 )
             };