diff --git a/ci/travis_osx_script b/ci/travis_osx_script
index 6626a3c781..c53acc0e7e 100755
--- a/ci/travis_osx_script
+++ b/ci/travis_osx_script
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -x
+set -e
 
 mkdir build
 cd build
@@ -8,6 +9,11 @@ cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@5/ -DCMAKE_INSTALL_PREFIX=$(pwd
 make VERBOSE=1
 make install
 
+# TODO: we run the tests separately because when run all together there is some
+# mysterious issue where after N child process spawns it crashes. I've been
+# unable to reproduce the issue on my macbook - it only happens on Travis.
+# ./zig build --build-file ../build.zig test
+
 ./zig build --build-file ../build.zig test-behavior --verbose
 ./zig build --build-file ../build.zig test-std --verbose
 ./zig build --build-file ../build.zig test-compiler-rt --verbose