diff --git a/api/src/main/java/org/apache/cloudstack/api/response/GuestOSResponse.java b/api/src/main/java/org/apache/cloudstack/api/response/GuestOSResponse.java
index 6822288a862..c1a57c3e0e1 100644
--- a/api/src/main/java/org/apache/cloudstack/api/response/GuestOSResponse.java
+++ b/api/src/main/java/org/apache/cloudstack/api/response/GuestOSResponse.java
@@ -41,7 +41,7 @@ public class GuestOSResponse extends BaseResponse {
 
     @SerializedName(ApiConstants.IS_USER_DEFINED)
     @Param(description = "is the guest OS user defined")
-    private String isUserDefined;
+    private Boolean isUserDefined;
 
     public String getId() {
         return id;
@@ -67,11 +67,11 @@ public class GuestOSResponse extends BaseResponse {
         this.description = description;
     }
 
-    public String getIsUserDefined() {
+    public Boolean getIsUserDefined() {
         return isUserDefined;
     }
 
-    public void setIsUserDefined(String isUserDefined) {
+    public void setIsUserDefined(Boolean isUserDefined) {
         this.isUserDefined = isUserDefined;
     }
 
diff --git a/server/src/main/java/com/cloud/api/ApiResponseHelper.java b/server/src/main/java/com/cloud/api/ApiResponseHelper.java
index bd9b543c58f..0cab30e55d8 100644
--- a/server/src/main/java/com/cloud/api/ApiResponseHelper.java
+++ b/server/src/main/java/com/cloud/api/ApiResponseHelper.java
@@ -3203,7 +3203,7 @@ public class ApiResponseHelper implements ResponseGenerator {
         GuestOSResponse response = new GuestOSResponse();
         response.setDescription(guestOS.getDisplayName());
         response.setId(guestOS.getUuid());
-        response.setIsUserDefined(Boolean.valueOf(guestOS.getIsUserDefined()).toString());
+        response.setIsUserDefined(guestOS.getIsUserDefined());
         GuestOSCategoryVO category = ApiDBUtils.findGuestOsCategoryById(guestOS.getCategoryId());
         if (category != null) {
             response.setOsCategoryId(category.getUuid());