diff --git a/install.sh b/install.sh
index 68f383de..f2946cb6 100755
--- a/install.sh
+++ b/install.sh
@@ -1,5 +1,7 @@
 #!/bin/bash -v
 
+set -e ; set -u
+
 cp	libfloatimg.a 	/usr/local/lib
 cp	floatimg.h 	/usr/local/include