diff --git a/Android.mk b/Android.mk
index 77ed0e2..de76dd6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -22,7 +22,7 @@
 	pngwtran.c \
 	pngwutil.c
 
-common_CFLAGS := -fvisibility=hidden ## -fomit-frame-pointer
+common_CFLAGS := -std=gnu89 -fvisibility=hidden ## -fomit-frame-pointer
 
 ifeq ($(HOST_OS),windows)
   ifeq ($(USE_MINGW),)
@@ -59,7 +59,7 @@
 # =====================================================
 
 include $(CLEAR_VARS)
-# LOCAL_CLANG := true
+LOCAL_CLANG := true
 LOCAL_SRC_FILES := $(common_SRC_FILES)
 LOCAL_CFLAGS += $(common_CFLAGS) -ftrapv
 LOCAL_C_INCLUDES += $(common_C_INCLUDES) \