diff --git a/.changes/android-proguard.md b/.changes/android-proguard.md
new file mode 100644
index 000000000000..d9914873e766
--- /dev/null
+++ b/.changes/android-proguard.md
@@ -0,0 +1,7 @@
+---
+"tauri": "patch:bug"
+"tauri-cli": "patch:bug"
+"@tauri-apps/cli": "patch:bug"
+---
+
+Fix android invalid proguard file when using an `identifier` that contains a component that is a reserved kotlin keyword, like `in`, `class`, etc
diff --git a/crates/tauri-cli/src/mobile/android/mod.rs b/crates/tauri-cli/src/mobile/android/mod.rs
index 1866c8ab9700..7521e87a9d4e 100644
--- a/crates/tauri-cli/src/mobile/android/mod.rs
+++ b/crates/tauri-cli/src/mobile/android/mod.rs
@@ -139,6 +139,7 @@ pub fn get_config(
     "WRY_ANDROID_PACKAGE",
     app.android_identifier_escape_kotlin_keyword(),
   );
+  set_var("TAURI_ANDROID_PACKAGE_UNESCAPED", app.identifier());
   set_var("WRY_ANDROID_LIBRARY", app.lib_name());
   set_var("TAURI_ANDROID_PROJECT_PATH", config.project_dir());
 
diff --git a/crates/tauri/build.rs b/crates/tauri/build.rs
index 6d51bdecf0ca..047f2843956c 100644
--- a/crates/tauri/build.rs
+++ b/crates/tauri/build.rs
@@ -260,13 +260,13 @@ fn main() {
   }
 
   if target_os == "android" {
-    if let Ok(kotlin_out_dir) = std::env::var("WRY_ANDROID_KOTLIN_FILES_OUT_DIR") {
-      fn env_var(var: &str) -> String {
-        std::env::var(var).unwrap_or_else(|_| {
-          panic!("`{var}` is not set, which is needed to generate the kotlin files for android.")
-        })
-      }
+    fn env_var(var: &str) -> String {
+      std::env::var(var).unwrap_or_else(|_| {
+        panic!("`{var}` is not set, which is needed to generate the kotlin files for android.")
+      })
+    }
 
+    if let Ok(kotlin_out_dir) = std::env::var("WRY_ANDROID_KOTLIN_FILES_OUT_DIR") {
       let package = env_var("WRY_ANDROID_PACKAGE");
       let library = env_var("WRY_ANDROID_LIBRARY");
 
@@ -299,11 +299,9 @@ fn main() {
     }
 
     if let Some(project_dir) = env::var_os("TAURI_ANDROID_PROJECT_PATH").map(PathBuf::from) {
-      let tauri_proguard = include_str!("./mobile/proguard-tauri.pro").replace(
-        "$PACKAGE",
-        &env::var("WRY_ANDROID_PACKAGE")
-          .expect("missing `WRY_ANDROID_PACKAGE` environment variable"),
-      );
+      let package_unescaped = env_var("TAURI_ANDROID_PACKAGE_UNESCAPED");
+      let tauri_proguard =
+        include_str!("./mobile/proguard-tauri.pro").replace("$PACKAGE", &package_unescaped);
       std::fs::write(
         project_dir.join("app").join("proguard-tauri.pro"),
         tauri_proguard,