diff --git a/MacPass/KPKEntry+MPCustomAttributeProperties.m b/MacPass/KPKEntry+MPCustomAttributeProperties.m
index 8e2eb37e..fabc6d6b 100644
--- a/MacPass/KPKEntry+MPCustomAttributeProperties.m
+++ b/MacPass/KPKEntry+MPCustomAttributeProperties.m
@@ -36,7 +36,7 @@ static id propertyIMP(id self, SEL _cmd) {
 
 + (BOOL)resolveInstanceMethod:(SEL)aSEL {
   if ([NSStringFromSelector(aSEL) hasPrefix:MPCustomAttributePropertyPrefix]) {
-    class_addMethod([self class], aSEL,(IMP)propertyIMP, "@@:");
+    class_addMethod(self.class, aSEL,(IMP)propertyIMP, "@@:");
     return YES;
   }
   return [super resolveInstanceMethod:aSEL];