diff --git a/build.sh b/build.sh
index 9db32082..e12f16a3 100755
--- a/build.sh
+++ b/build.sh
@@ -1,20 +1,17 @@
 #!/bin/bash
 
+set -e
+
 TARGET=${TARGET-x86_64-unknown-linux-gnu}
 if [ "$TARGET" != "" ]; then
     TGT="--target $TARGET"
 fi
 VERSION=debug
-if [[ "$1" == "--release" ]]; then
+if [ "$1" == "--release" ]; then
     VERSION=release
 fi
 
 cargo build --verbose $TGT $1
-if [ ! -e ./youki ]; then
-    rm -f youki
-fi 
-if [ ! -e ./youki_integration_test ]; then
-    rm -f youki_integration_test
-fi
+
 cp target/$TARGET/$VERSION/youki .
 cp target/$TARGET/$VERSION/integration_test ./youki_integration_test