diff --git a/android/olm-sdk/src/main/jni/Android.mk b/android/olm-sdk/src/main/jni/Android.mk
index aceaef0..44a2787 100644
--- a/android/olm-sdk/src/main/jni/Android.mk
+++ b/android/olm-sdk/src/main/jni/Android.mk
@@ -21,6 +21,9 @@ LOCAL_CFLAGS+= -DOLMLIB_VERSION_MAJOR=$(MAJOR) \
 
 #LOCAL_CFLAGS+= -DNDK_DEBUG
 
+LOCAL_CFLAGS+=-fstack-protector-all -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Wall
+LOCAL_LDFLAGS=-z relro -z now
+
 LOCAL_C_INCLUDES+= $(LOCAL_PATH)/$(SRC_ROOT_DIR)/include/ \
 $(LOCAL_PATH)/$(SRC_ROOT_DIR)/lib
 
diff --git a/android/olm-sdk/src/main/jni/Application.mk b/android/olm-sdk/src/main/jni/Application.mk
index 6516f5e..e11f39a 100644
--- a/android/olm-sdk/src/main/jni/Application.mk
+++ b/android/olm-sdk/src/main/jni/Application.mk
@@ -1,3 +1,3 @@
 APP_PLATFORM := android-16
-APP_ABI := arm64-v8a armeabi-v7a armeabi x86_64  x86
-APP_STL := gnustl_static
\ No newline at end of file
+APP_ABI := arm64-v8a armeabi-v7a x86_64 x86
+APP_STL := gnustl_static
diff --git a/android/olm-sdk/src/main/jni/olm_jni.h b/android/olm-sdk/src/main/jni/olm_jni.h
index e6a49e2..6a5eb1d 100644
--- a/android/olm-sdk/src/main/jni/olm_jni.h
+++ b/android/olm-sdk/src/main/jni/olm_jni.h
@@ -21,6 +21,7 @@
 #include <cstdlib>
 #include <cstdio>
 #include <string>
+#include <string.h>
 #include <sstream>
 #include <jni.h>
 #include <android/log.h>