fix travis
diff --git a/.travis.yml b/.travis.yml
index c9055fe..72863ce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,7 @@
     - echo "Run static code analysis"
     - git clone https://github.com/apache/incubator-milagro-crypto-c.git 
     - cd incubator-milagro-crypto-c
+    - git checkout b4ddc1497cba42fe7a262016794194f75569d10c
     - mkdir build
     - cd build
     - cmake -D CMAKE_BUILD_TYPE=Release -D BUILD_SHARED_LIBS=ON -D AMCL_CHUNK=64 -D AMCL_CURVE="BLS381,SECP256K1" -D AMCL_RSA="" -D BUILD_PAILLIER=ON -D BUILD_PYTHON=OFF -D BUILD_BLS=ON -D BUILD_WCC=OFF -D BUILD_MPIN=OFF -D BUILD_X509=OFF -D CMAKE_INSTALL_PREFIX=/usr/local ..