diff --git a/scripts/build-and-provide-package b/scripts/build-and-provide-package
index 516941d..e240ca0 100755
--- a/scripts/build-and-provide-package
+++ b/scripts/build-and-provide-package
@@ -5,6 +5,9 @@ if [ -z ${JENKINS_DEBIAN_GLUE_QUIET:-} ]; then
 fi
 set -u
 
+# Debian bug #531885: cowbuilder build fails with restrictive umask
+umask 022
+
 # make sure cowbuilder/pbuilder/... are available
 PATH='/bin:/sbin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin'