--- a/mobile/android/base/Makefile.in
+++ b/mobile/android/base/Makefile.in
@@ -237,17 +237,17 @@ ifdef MOZ_BUILD_MOBILE_ANDROID_WITH_GRAD
 		app:assembleOfficialAustralisDebug app:assembleOfficialAustralisDebugAndroidTest -x lint
 
 classes.dex: .gradle.deps
 	$(REPORT_BUILD)
 	cp $(gradle_dir)/app/intermediates/transforms/dex/officialAustralis/debug/folders/1000/1f/main/classes.dex $@
 else
 classes.dex: .proguard.deps
 	$(REPORT_BUILD)
-	$(DX) --dex --output=classes.dex jars-proguarded
+	$(DX) --dex --output=classes.dex --force-jumbo jars-proguarded
 endif
 
 ifdef MOZ_DISABLE_PROGUARD
   PROGUARD_PASSES=0
 else
   ifdef MOZ_DEBUG
     PROGUARD_PASSES=1
   else