diff --git a/spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java b/spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java
index 623e27bf..9c5c450a 100644
--- a/spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java
+++ b/spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java
@@ -121,7 +121,8 @@ public class EurekaDiscoveryClient implements DiscoveryClient {
 
 		@Override
 		public boolean isSecure() {
-			return this.instance.isPortEnabled(SECURE);
+			// assume if unsecure is enabled, that is the default
+			return !this.instance.isPortEnabled(UNSECURE) && this.instance.isPortEnabled(SECURE);
 		}
 
 		@Override