diff --git a/tests/unit-tests/run-unit-tests.sh b/tests/unit-tests/run-unit-tests.sh
index 34860b2..4112c23 100755
--- a/tests/unit-tests/run-unit-tests.sh
+++ b/tests/unit-tests/run-unit-tests.sh
@@ -71,8 +71,7 @@ fi
 ${PKG_MAINT_TOOL} ${PKG_MAINT_TOOL_EXTRA_ARGS} prep
 
 # Extract the Source0 basename without extension
-SRC_DIR=$(rpmdev-spectool --source 0 osbuild.spec | awk '{print $2}' | sed 's/.tar.gz//')
-SRC_DIR="${SRC_DIR##*/}"
+SRC_DIR=$(spectool --source 0 osbuild.spec | sed 's/.\+\(osbuild-[0-9]\+\)\.tar\.gz/\1/')
 
 cd "${SRC_DIR}"