diff --git a/src/main/java/com/cloudbees/jenkins/plugins/amazonecs/aws/BaseAWSService.java b/src/main/java/com/cloudbees/jenkins/plugins/amazonecs/aws/BaseAWSService.java
index 6a7c4410..64d11507 100644
--- a/src/main/java/com/cloudbees/jenkins/plugins/amazonecs/aws/BaseAWSService.java
+++ b/src/main/java/com/cloudbees/jenkins/plugins/amazonecs/aws/BaseAWSService.java
@@ -41,7 +41,7 @@ protected ClientConfiguration createClientConfiguration() {
             clientConfiguration.setProxyPassword(proxy.getPassword());
             if (proxy.getNoProxyHost() != null) {
                 String[] noProxyParts = proxy.getNoProxyHost().split("[ \t\n,|]+");
-                clientConfiguration.setNonProxyHosts(Joiner.on(',').join(noProxyParts));
+                clientConfiguration.setNonProxyHosts(Joiner.on('|').join(noProxyParts));
             }
         }