diff --git a/.travis.yml b/.travis.yml
index cb10ba4ce..99b9b6716 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,7 @@ matrix:
         packages:
         - gcc-4.8
         - libgmp-dev
+        - libm4ri-dev
     before_install:
       - sh .travis/install-clang-format-linux.sh
   - os: linux
@@ -25,6 +26,7 @@ matrix:
         - ubuntu-toolchain-r-test
         packages:
         - gcc-4.9
+        - libm4ri-dev
     before_install:
       - sh .travis/install-clang-format-linux.sh
   - os: linux
@@ -36,6 +38,7 @@ matrix:
         - ubuntu-toolchain-r-test
         packages:
         - gcc-5
+        - libm4ri-dev
     before_install:
       - sh .travis/install-clang-format-linux.sh
   - os: linux
@@ -48,13 +51,14 @@ matrix:
         packages:
         - gcc-6
         - libssl-dev
+        - libm4ri-dev
     before_install:
       - sh .travis/install-clang-format-linux.sh
   - os: osx
     compiler: clang
     env: CC_OQS=clang AES_NI=0 USE_OPENSSL=1 ENABLE_CODE_MCBITS=1 ENABLE_NTRU=1 ENABLE_SIDH_IQC_REF=1
 before_install:
-      - brew install clang-format openssl libsodium
+      - brew install clang-format openssl libsodium libm4ri-dev
 
 script:
   - CC=$CC_OQS ./.travis-tests.sh