diff --git a/MVMCoreUI/Atoms/TextFields/MdnEntryField.swift b/MVMCoreUI/Atoms/TextFields/MdnEntryField.swift
index 1b687a41..a0a893a6 100644
--- a/MVMCoreUI/Atoms/TextFields/MdnEntryField.swift
+++ b/MVMCoreUI/Atoms/TextFields/MdnEntryField.swift
@@ -88,7 +88,7 @@ import MVMCore
     
     @objc public func hasValidMDN() -> Bool {
         
-        guard let MDN = mdn, MDN.isEmpty else { return false }
+        guard let MDN = mdn, !MDN.isEmpty else { return false }
         
         if isNationalMDN {
             return MVMCoreUIUtility.validateMDNString(MDN)