diff --git a/drools-compiler/src/main/java/org/drools/compiler/PackageBuilder.java b/drools-compiler/src/main/java/org/drools/compiler/PackageBuilder.java
index 5f50e9c487b..ddde7a05f46 100644
--- a/drools-compiler/src/main/java/org/drools/compiler/PackageBuilder.java
+++ b/drools-compiler/src/main/java/org/drools/compiler/PackageBuilder.java
@@ -683,7 +683,7 @@ public void addPackage(final PackageDescr packageDescr) {
                           packageDescrsForPackage );
         }
         packageDescrsForPackage.add( packageDescr );
-        List<ImportDescr> imports = new ArrayList<ImportDescr>();
+        Set<ImportDescr> imports = new HashSet<ImportDescr>();
         for ( PackageDescr pd : packageDescrsForPackage ) {
             imports.addAll( pd.getImports() );
         }