diff --git a/ci/install_osx.sh b/ci/install_osx.sh
index 066289a128f8425e351ae70cf50437667bb7b689..f9314bef5bdde8bdd7e1bc58d0c78b07038b85cc 100755
--- a/ci/install_osx.sh
+++ b/ci/install_osx.sh
@@ -5,3 +5,4 @@ brew install cmake
 brew install boost
 brew install libccd
 brew install assimp
+brew install eigen