fix build errors
diff --git a/common/Android.mk b/common/Android.mk
index d365910..a50afae 100644
--- a/common/Android.mk
+++ b/common/Android.mk
@@ -93,7 +93,7 @@
     $(LOCAL_PATH)
 
 LOCAL_CFLAGS := -Ofast -Wall -Wformat=2 -DNDEBUG -UNDEBUG -Werror
-LOCAL_CFLAGS += -Wno-unused-parameter
+LOCAL_CFLAGS += -Wno-unused-parameter -Wno-implicit-fallthrough
 
 LOCAL_CPPFLAGS := -std=c++11 -fexceptions -frtti
 
diff --git a/common/Android.mk.in b/common/Android.mk.in
index 176e9a6..86cea16 100644
--- a/common/Android.mk.in
+++ b/common/Android.mk.in
@@ -12,7 +12,7 @@
     $(LOCAL_PATH)
 
 LOCAL_CFLAGS := -Ofast -Wall -Wformat=2 -DNDEBUG -UNDEBUG -Werror
-LOCAL_CFLAGS += -Wno-unused-parameter
+LOCAL_CFLAGS += -Wno-unused-parameter -Wno-implicit-fallthrough
 
 LOCAL_CPPFLAGS := -std=c++11 -fexceptions -frtti