diff --git a/bin/pwdb b/bin/pwdb
index d80157e..35cb5a0 100755
--- a/bin/pwdb
+++ b/bin/pwdb
@@ -38,6 +38,9 @@ EOF
     exit ${1:-0}
 }
 
+# Let -i option default to number of CPU cores, use the output of nproc for this.
+JOBS=$(nproc)
+
 db_exec()
 {
     echo "psql -h $TARGET -xU root -d ${2:-postgres} -c \"$1\""