diff --git a/build.sh b/build.sh
index b017e08..bc429f6 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 make -C gcc clean
 make -C gcc old
 mv gcc/old_agbcc .
diff --git a/install.sh b/install.sh
index 12a99f4..756c78a 100755
--- a/install.sh
+++ b/install.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 if [ "$1" != "" ]; then
     mkdir -p $1/tools/agbcc
     mkdir -p $1/tools/agbcc/bin