diff --git a/core/src/main/java/org/acegisecurity/acls/domain/BasePermission.java b/core/src/main/java/org/acegisecurity/acls/domain/BasePermission.java
index 19d23cedad..68fd6480fa 100644
--- a/core/src/main/java/org/acegisecurity/acls/domain/BasePermission.java
+++ b/core/src/main/java/org/acegisecurity/acls/domain/BasePermission.java
@@ -161,4 +161,8 @@ public final class BasePermission implements Permission {
     public String toString() {
         return "BasePermission[" + getPattern() + "=" + mask + "]";
     }
+    
+	public int hashCode() {
+		return this.mask;
+	}
 }
diff --git a/core/src/main/java/org/acegisecurity/acls/domain/CumulativePermission.java b/core/src/main/java/org/acegisecurity/acls/domain/CumulativePermission.java
index 33b2e5e70e..7b6b67e64f 100644
--- a/core/src/main/java/org/acegisecurity/acls/domain/CumulativePermission.java
+++ b/core/src/main/java/org/acegisecurity/acls/domain/CumulativePermission.java
@@ -56,8 +56,12 @@ public class CumulativePermission implements Permission {
 
         return (this.mask == rhs.getMask());
     }
+    
+	public int hashCode() {
+		return this.mask;
+	}
 
-    public int getMask() {
+	public int getMask() {
         return this.mask;
     }