diff --git a/Android.mk b/Android.mk
index e2ed18b..06ac9e6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -64,11 +64,11 @@
     LOCAL_REQUIRED_MODULES:= libframesequence libgiftranscode
 endif
 
-LOCAL_PROGUARD_FLAGS := -ignorewarnings -include build/core/proguard_basic_keeps.flags
+LOCAL_PROGUARD_FLAGS := -ignorewarnings
 
 LOCAL_PROGUARD_ENABLED := nosystem
 
-LOCAL_PROGUARD_FLAG_FILES := proguard.flags
+LOCAL_PROGUARD_FLAG_FILES := ../../../build/core/proguard_basic_keeps.flags proguard.flags
 ifeq (eng,$(TARGET_BUILD_VARIANT))
     LOCAL_PROGUARD_FLAG_FILES += proguard-test.flags
 else
diff --git a/jni/Android.mk b/jni/Android.mk
index cd89b8f..dbc0674 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -29,7 +29,7 @@
 
 LOCAL_CFLAGS += -Wall -Wno-unused-parameter -Wno-switch
 
-LOCAL_SDK_VERSION := 8
+LOCAL_SDK_VERSION := 19
 LOCAL_NDK_STL_VARIANT := c++_static # LLVM libc++
 
 include $(BUILD_SHARED_LIBRARY)
diff --git a/jni/GifTranscoder.cpp b/jni/GifTranscoder.cpp
index 1f329f7..6c71013 100644
--- a/jni/GifTranscoder.cpp
+++ b/jni/GifTranscoder.cpp
@@ -24,7 +24,7 @@
 
 #include "GifTranscoder.h"
 
-#define SQUARE(a) (a)*(a)
+#define SQUARE(a) ((a)*(a))
 
 // GIF does not support partial transparency, so our alpha channels are always 0x0 or 0xff.
 static const ColorARGB TRANSPARENT = 0x0;
@@ -37,7 +37,7 @@
 #define MAKE_COLOR_ARGB(a, r, g, b) \
     ((a) << 24 | (r) << 16 | (g) << 8 | (b))
 
-#define MAX_COLOR_DISTANCE 255 * 255 * 255
+#define MAX_COLOR_DISTANCE (255 * 255 * 255)
 
 #define TAG "GifTranscoder.cpp"
 #define LOGD_ENABLED 0
diff --git a/proguard.flags b/proguard.flags
index 76b033c..759f2d4 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -23,7 +23,7 @@
 }
 
 # Keep methods that have the @VisibleForAnimation annotation
--keep interface com.android.messaging.annotation.VisibleForAnimation
+-keep @interface com.android.messaging.annotation.VisibleForAnimation
 -keepclassmembers class * {
   @com.android.messaging.annotation.VisibleForAnimation *;
 }