Fix typo

Change-Id: Ie912a843b1b7fecaad6f2f1ef4dd6596a59e7037
diff --git a/src/com/mirantis/mk/Aptly.groovy b/src/com/mirantis/mk/Aptly.groovy
index d50df24..b7353e9 100644
--- a/src/com/mirantis/mk/Aptly.groovy
+++ b/src/com/mirantis/mk/Aptly.groovy
@@ -115,7 +115,7 @@
  * @param opts          Options: debug, timeout, ...
  */
 def dumpPublishes(server, prefix, publishes='all', opts='-d --timeout 600') {
-    sh("aptly-publisher dump --url ${server} --save-dir . --prefix ${prefix} --p ${publishes} ${opts}")
+    sh("aptly-publisher dump --url ${server} --save-dir . --prefix ${prefix} -p ${publishes} ${opts}")
     archiveArtifacts artifacts: "${prefix}*"
 }