diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index fb164d666..c2b57117c 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -1 +1,7 @@
 # Add project specific ProGuard rules here.
+
+# Firebase component registrars are instantiated via reflection.
+# R8 strips their no-arg constructors without this rule.
+-keep class com.google.firebase.** implements com.google.firebase.components.ComponentRegistrar {
+    <init>();
+}