diff --git a/image/tool/wait-process b/image/tool/wait-process
index 0b3fdd25..6d882b48 100755
--- a/image/tool/wait-process
+++ b/image/tool/wait-process
@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-source /container/run/environment.sh
+. /container/run/environment.sh
 
 # wait startup to finish
 while ! test -f ${CONTAINER_STATE_DIR}/startup-done