diff --git a/src/main/org/apache/tools/ant/taskdefs/Definer.java b/src/main/org/apache/tools/ant/taskdefs/Definer.java
index 7ef02c422..66d177b2d 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Definer.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Definer.java
@@ -249,6 +249,7 @@ public abstract class Definer extends DefBase {
 
                 if (format == Format.PROPERTIES) {
                     loadProperties(al, url);
+                    break;
                 } else {
                     loadAntlib(al, url);
                 }