diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/NancyFXServerCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/NancyFXServerCodegen.java
index b757ea0f12b..213efa0fd28 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/NancyFXServerCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/NancyFXServerCodegen.java
@@ -90,6 +90,7 @@ public class NancyFXServerCodegen extends AbstractCSharpCodegen {
         addSwitch(RETURN_ICOLLECTION, RETURN_ICOLLECTION_DESC, returnICollection);
         addSwitch(IMMUTABLE_OPTION, "Enabled by default. If disabled generates model classes with setters", true);
         typeMapping.putAll(nodaTimeTypesMappings());
+        languageSpecificPrimitives.addAll(nodaTimePrimitiveTypes());
 
         importMapping.clear();
     }
@@ -387,6 +388,10 @@ public class NancyFXServerCodegen extends AbstractCSharpCodegen {
                 "datetime", "ZonedDateTime?");
     }
 
+    private static Set<String> nodaTimePrimitiveTypes() {
+        return ImmutableSet.of("LocalTime?", "ZonedDateTime?");
+    }
+
     private class DependencyInfo {
         private final String version;
         private final String framework;