diff --git a/Jenkinsfile b/Jenkinsfile
index 0f2b43b..d438f32 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -22,9 +22,9 @@ node("docker && linux && amd64") {
 	stage("Build") {
 		def imageVersion
 
-		versions.forEach { versions ->
-			def tomcatVersion = versions[0]
-			def jreVersion = versions[1]
+		versions.forEach { version ->
+			def tomcatVersion = version[0]
+			def jreVersion = version[1]
 
 			def guacamoleVersion
 			def image = docker.build("", "--build-arg TOMCAT_VERSION=${tomcatVersion} --build-arg JRE_VERSION=${jreVersion} .")