diff --git a/python/python3-ujson/python3-ujson.SlackBuild b/python/python3-ujson/python3-ujson.SlackBuild
index d5f44a219b..484e2591cb 100644
--- a/python/python3-ujson/python3-ujson.SlackBuild
+++ b/python/python3-ujson/python3-ujson.SlackBuild
@@ -25,7 +25,7 @@
 cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=python3-ujson
-SRCNAM=$(echo $PRGNAM | sed "s/python3-//")
+SRCNAM=${PRGNAM#python3-*}
 VERSION=${VERSION:-5.7.0}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}