diff --git a/ci/travis_linux_script b/ci/travis_linux_script
index f2f4bd95d36cf354ec09439826669f8dc8d4aa40..f823429a4c90c82c85de829b9d188ce0d3219519 100755
--- a/ci/travis_linux_script
+++ b/ci/travis_linux_script
@@ -8,7 +8,7 @@ export CXX=clang++-6.0
 echo $PATH
 mkdir build
 cd build
-cmake .. -DCMAKE_INSTALL_PREFIX=$(pwd)
+cmake .. -DCMAKE_BUILD_TYPE=Release
 make -j2 install
 ./zig build --build-file ../build.zig test
 
diff --git a/ci/travis_osx_script b/ci/travis_osx_script
index 56cf45cd5fab350a2108bfaed344bdb624f9fd63..7fa54d26fdc6b3ea00ed175df834e72eb0a35bfd 100755
--- a/ci/travis_osx_script
+++ b/ci/travis_osx_script
@@ -5,7 +5,7 @@ set -e
 
 mkdir build
 cd build
-cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@6/ -DCMAKE_INSTALL_PREFIX=$(pwd)
+cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@6/ -DCMAKE_BUILD_TYPE=Release
 make VERBOSE=1
 make install