diff --git a/build/scripts/build_cross_tools b/build/scripts/build_cross_tools
index 19e0ee303f..58776f1761 100755
--- a/build/scripts/build_cross_tools
+++ b/build/scripts/build_cross_tools
@@ -11,6 +11,8 @@ if [ $# -lt 3 ]; then
 	exit 1
 fi
 
+set -e
+
 haikuSourceDir=$1
 buildToolsDir=$2/legacy
 installDir=$3
diff --git a/build/scripts/build_cross_tools_gcc4 b/build/scripts/build_cross_tools_gcc4
index 55057da9f0..a54dc020b1 100755
--- a/build/scripts/build_cross_tools_gcc4
+++ b/build/scripts/build_cross_tools_gcc4
@@ -9,6 +9,8 @@ if [ $# -lt 4 ]; then
 	exit 1
 fi
 
+set -e
+
 haikuMachine=$1
 haikuSourceDir=$2
 buildToolsDir=$3