diff --git a/common/tests/Android.mk b/common/tests/Android.mk
index 0f2c3e4..74255521 100644
--- a/common/tests/Android.mk
+++ b/common/tests/Android.mk
@@ -23,4 +23,6 @@
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_STATIC_JAVA_LIBRARIES := android-common
 
+LOCAL_PROGUARD_ENABLED := disabled
+
 include $(BUILD_PACKAGE)
diff --git a/packages/TtsService/Android.mk b/packages/TtsService/Android.mk
index 5eb6b9c..75b26a2 100644
--- a/packages/TtsService/Android.mk
+++ b/packages/TtsService/Android.mk
@@ -8,6 +8,8 @@
 LOCAL_PACKAGE_NAME := TtsService
 LOCAL_CERTIFICATE := platform
 
+LOCAL_PROGUARD_FLAGS := -include $(LOCAL_PATH)/proguard.flags
+
 include $(BUILD_PACKAGE)
 
 include $(call all-makefiles-under,$(LOCAL_PATH))
diff --git a/packages/TtsService/proguard.flags b/packages/TtsService/proguard.flags
new file mode 100644
index 0000000..e8bee6b
--- /dev/null
+++ b/packages/TtsService/proguard.flags
@@ -0,0 +1,5 @@
+-keep class android.tts.SynthProxy {
+  int mJniData;
+  # keep all declarations for native methods
+  <methods>;
+}
diff --git a/tests/LotsOfApps/Android.mk b/tests/LotsOfApps/Android.mk
index 8d0cfa3..0ef9550 100644
--- a/tests/LotsOfApps/Android.mk
+++ b/tests/LotsOfApps/Android.mk
@@ -8,4 +8,6 @@
 LOCAL_PACKAGE_NAME := LotsOfApps
 LOCAL_CERTIFICATE := platform
 
+LOCAL_PROGUARD_ENABLED := disabled
+
 include $(BUILD_PACKAGE)
diff --git a/tests/backup/Android.mk b/tests/backup/Android.mk
index 498ec40..31e2ec5 100644
--- a/tests/backup/Android.mk
+++ b/tests/backup/Android.mk
@@ -40,5 +40,7 @@
 
 LOCAL_PACKAGE_NAME := BackupTest
 
+LOCAL_PROGUARD_ENABLED := disabled
+
 include $(BUILD_PACKAGE)