diff --git a/bin/objc-petstore.sh b/bin/objc-petstore.sh
index d4df6924bf8..df22ea3b595 100755
--- a/bin/objc-petstore.sh
+++ b/bin/objc-petstore.sh
@@ -26,6 +26,6 @@ fi
 
 # if you've executed sbt assembly previously it will use that instead.
 export JAVA_OPTS="${JAVA_OPTS} -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties"
-ags="$@ generate -t modules/swagger-codegen/src/main/resources/objc -i modules/swagger-codegen/src/test/resources/2_0/petstore.json -l objc -o samples/client/petstore/objc --additional-properties coreData=y"
+ags="$@ generate -t modules/swagger-codegen/src/main/resources/objc -i modules/swagger-codegen/src/test/resources/2_0/petstore.json -l objc -o samples/client/petstore/objc --additional-properties coreData=true"
 
 java -DappName=PetstoreClient $JAVA_OPTS -jar $executable $ags
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/ObjcClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/ObjcClientCodegen.java
index 68ba63a9382..67cf272c0ba 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/ObjcClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/ObjcClientCodegen.java
@@ -151,7 +151,7 @@ public class ObjcClientCodegen extends DefaultCodegen implements CodegenConfig {
         instantiationTypes.put("map", "NSMutableDictionary");
 
         cliOptions.clear();
-        cliOptions.add(new CliOption(CORE_DATA, "Should generate core data models").defaultValue("n"));
+        cliOptions.add(new CliOption(CORE_DATA, "Should generate core data models").defaultValue("false"));
         cliOptions.add(new CliOption(CLASS_PREFIX, "prefix for generated classes (convention: Abbreviation of pod name e.g. `HN` for `HackerNews`).`")
                 .defaultValue("SWG"));
         cliOptions.add(new CliOption(POD_NAME, "cocoapods package name (convention: CameCase).")
@@ -193,7 +193,7 @@ public class ObjcClientCodegen extends DefaultCodegen implements CodegenConfig {
 
         if (additionalProperties.containsKey(CORE_DATA)) {
             Object coreData = additionalProperties.get(CORE_DATA);
-            if(((String)coreData).equalsIgnoreCase("y")) {
+            if(((String)coreData).equalsIgnoreCase("true")) {
                 generateCoreData = true;
             }
         }