diff --git a/prepare_sources.sh b/prepare_sources.sh
index aefa8e7..1549b16 100755
--- a/prepare_sources.sh
+++ b/prepare_sources.sh
@@ -32,6 +32,8 @@ cd $topdir/submodules/externals/libvpx && ./configure --target=armv7-android-gcc
 
 cd $topdir/submodules/mssilk && ./autogen.sh && ./configure --host=arm-linux MEDIASTREAMER_CFLAGS=" " MEDIASTREAMER_LIBS=" " && cd sdk && make extract-sources || ( echo "SILK audio plugin prepare state failed." ; exit 1 )
 
+cd $topdir/submodules/externals/srtp/ && cp ../build/srtp/config.h . || ( echo "SRTP prepare state failed." ; exit 1 )
+
 cd $topdir/submodules/linphone/mediastreamer2/src/
 # extract rules to build shader files
 vs_rule=`cat Makefile.am | grep xxd | grep yuv2rgb.vs | sed 's/$$builddir/./'`
diff --git a/submodules/externals/build/srtp/Android.mk b/submodules/externals/build/srtp/Android.mk
index e9c85e1..f40c8a2 100644
--- a/submodules/externals/build/srtp/Android.mk
+++ b/submodules/externals/build/srtp/Android.mk
@@ -4,6 +4,7 @@ include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := \
 	 	 srtp/srtp.c \
+		 srtp/ekt.c \
 	 	 crypto/ae_xfm/xfm.c \
 	 	 crypto/cipher/aes.c \
 	 	 crypto/cipher/aes_cbc.c \