diff --git a/build.sh b/build.sh
index a8e8d5f..f6fe9ec 100755
--- a/build.sh
+++ b/build.sh
@@ -13,6 +13,7 @@ LIB="$HERE/lib"
 source "${LIB}/print.sh"
 source "${LIB}/opt.sh"
 # -----------------------------------------------------------------------------
+set -eo pipefail
 
 # Runs the next build step.
 #