diff --git a/salt/common/tools/sbin/so-common b/salt/common/tools/sbin/so-common
index 9382fe472..f124e4f64 100755
--- a/salt/common/tools/sbin/so-common
+++ b/salt/common/tools/sbin/so-common
@@ -165,7 +165,7 @@ wait_for_apt() {
 				$progress_callback "$retry_msg"
 			fi
 		else
-			[[ -z $progress_callback ]] && $progress_callback "$old_text"
+			[[ -z $progress_callback ]] || $progress_callback "$old_text"
 			return 0
 		fi
 		sleep "$retry_timeout"