diff --git a/oem/firstvoices/ios/build.sh b/oem/firstvoices/ios/build.sh
index 6270ba55d0..8450e958f1 100755
--- a/oem/firstvoices/ios/build.sh
+++ b/oem/firstvoices/ios/build.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 ./build_keyboards.sh -copy-keyboards
 
 TARGET=FirstVoices