diff --git a/meta/recipes-extended/sed/sed/run-ptest b/meta/recipes-extended/sed/sed/run-ptest
index 993d7d5d75..0460c7961f 100644
--- a/meta/recipes-extended/sed/sed/run-ptest
+++ b/meta/recipes-extended/sed/sed/run-ptest
@@ -2,4 +2,4 @@
 
 chown nobody testsuite
 chown nobody ../ptest
-su nobody -c "make test-suite.log"
+su nobody -s /bin/sh -c "make test-suite.log"