diff --git a/vars/drafter.groovy b/vars/drafter.groovy
index 55f161a..701b0f1 100644
--- a/vars/drafter.groovy
+++ b/vars/drafter.groovy
@@ -18,7 +18,7 @@
     if (response.status == 202) {
         def job = readJSON(text: response.content)
         drafter.waitForJob(
-                "${baseUrl}${job['finished-job']}",
+                "${baseUrl}${job['finished-job']}" as String,
                 credentials, job['restart-id'] as String)
     } else {
         error "Problem deleting draftset ${response.status} : ${response.content}"
@@ -62,7 +62,7 @@
     if (response.status == 202) {
         def job = readJSON(text: response.content)
         drafter.waitForJob(
-                "${baseUrl}${job['finished-job']}",
+                "${baseUrl}${job['finished-job']}" as String,
                 credentials, job['restart-id'] as String)
     } else {
         error "Problem adding data ${response.status} : ${response.content}"
@@ -77,7 +77,7 @@
     if (response.status == 202) {
         def job = readJSON(text: response.content)
         drafter.waitForJob(
-                "${baseUrl}${job['finished-job']}",
+                "${baseUrl}${job['finished-job']}" as String,
                 credentials, job['restart-id'] as String)
     } else {
         error "Problem publishing draftset ${response.status} : ${response.content}"
diff --git a/vars/runPipeline.groovy b/vars/runPipeline.groovy
index 33ef699..0abd20f 100644
--- a/vars/runPipeline.groovy
+++ b/vars/runPipeline.groovy
@@ -1,4 +1,4 @@
-def call(pipelineUrl, draftsetId, credentials, params) {
+def call(String pipelineUrl, String draftsetId, String credentials, params) {
     withCredentials([usernameColonPassword(credentialsId: credentials, variable: 'USERPASS')]) {
         String boundary = UUID.randomUUID().toString()
         def allParams = [
@@ -25,7 +25,7 @@
         if (importRequest.status == 202) {
             def importJob = readJSON(text: importRequest.content)
             String jobUrl = new java.net.URI(pipelineUrl).resolve(importJob['finished-job']) as String
-            drafter.waitForJob(jobUrl, credentials, importJob['restart-id'])
+            drafter.waitForJob(jobUrl, credentials, importJob['restart-id'] as String)
         } else {
             error "Failed import, ${importRequest.status} : ${importRequest.content}"
         }