diff --git a/mobile/android/app/proguard-rules.pro b/mobile/android/app/proguard-rules.pro
index 6c4d8fb..ce8782b 100644
--- a/mobile/android/app/proguard-rules.pro
+++ b/mobile/android/app/proguard-rules.pro
@@ -3,3 +3,8 @@
 -dontwarn com.google.mlkit.vision.text.devanagari.**
 -dontwarn com.google.mlkit.vision.text.japanese.**
 -dontwarn com.google.mlkit.vision.text.korean.**
+
+# Room creates WorkDatabase_Impl by reflection; R8 must retain its constructor.
+-keep class androidx.work.impl.WorkDatabase_Impl {
+    public <init>();
+}