Index: wrapper/core/src/main/resources/org/apache/karaf/wrapper/internal/unix/karaf-service
===================================================================
--- wrapper/core/src/main/resources/org/apache/karaf/wrapper/internal/unix/karaf-service	(revision 1365496)
+++ wrapper/core/src/main/resources/org/apache/karaf/wrapper/internal/unix/karaf-service	(working copy)
@@ -319,7 +319,7 @@
 
         # Still want to change users, recurse.  This means that the user will only be
         #  prompted for a password once.
-        su -m $RUN_AS_USER -c "$REALPATH $1"
+        su -m $RUN_AS_USER -s /bin/sh -c "$REALPATH $1"
 
         # Now that we are the original user again, we may need to clean up the lock file.
         if [ "X$LOCKPROP" != "X" ]