diff --git a/install_and_cache_pkgs.sh b/install_and_cache_pkgs.sh
index 7f1b90d..37fda4f 100755
--- a/install_and_cache_pkgs.sh
+++ b/install_and_cache_pkgs.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Fail on any error.
+set -e
+
 # Directory that holds the cached packages.
 cache_dir=$1
 # List of the packages to use.
diff --git a/restore_pkgs.sh b/restore_pkgs.sh
index c3bfe14..cfd292e 100755
--- a/restore_pkgs.sh
+++ b/restore_pkgs.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Fail on any error.
+set -e
+
 # Directory that holds the cached packages.
 cache_dir=$1
 # Root directory to untar the cached packages to.
diff --git a/validate_pkgs.sh b/validate_pkgs.sh
index 09e3e52..3b63a70 100755
--- a/validate_pkgs.sh
+++ b/validate_pkgs.sh
@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# Fail on any error.
+set -e
+
 packages=$1
 
 echo -n "* Validating action arguments... ";