diff --git a/SOPE/NGCards/ChangeLog b/SOPE/NGCards/ChangeLog
index ac57bddf2..20ec67b1f 100644
--- a/SOPE/NGCards/ChangeLog
+++ b/SOPE/NGCards/ChangeLog
@@ -1,5 +1,9 @@
 2010-05-05  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
 
+	* iCalPerson.m (-setParticipationStatus:, -participationStatus):
+	added handling of the new partstat value
+	"iCalPersonPartStatUndefined".
+
 	* iCalEntityObject.m (-resources): removed useless method.
 	(-nonParticipants): new method returning ATTENDEE objects having
 	their ROLE attribute set to "NON-PARTICIPANT".
diff --git a/SOPE/NGCards/iCalPerson.h b/SOPE/NGCards/iCalPerson.h
index 6c7644673..4aac91d14 100644
--- a/SOPE/NGCards/iCalPerson.h
+++ b/SOPE/NGCards/iCalPerson.h
@@ -25,6 +25,7 @@
 #import "CardElement.h"
 
 typedef enum {
+  iCalPersonPartStatUndefined    = -1, /* empty/undefined */
   iCalPersonPartStatNeedsAction  = 0, /* NEEDS-ACTION (DEFAULT) */
   iCalPersonPartStatAccepted     = 1, /* ACCEPTED               */
   iCalPersonPartStatDeclined     = 2, /* DECLINED               */
diff --git a/SOPE/NGCards/iCalPerson.m b/SOPE/NGCards/iCalPerson.m
index 971a0d101..449c1b012 100644
--- a/SOPE/NGCards/iCalPerson.m
+++ b/SOPE/NGCards/iCalPerson.m
@@ -133,6 +133,9 @@
   NSString *stat;
 
   switch (_status) {
+    case iCalPersonPartStatUndefined:
+      stat = @"";
+      break;
     case iCalPersonPartStatAccepted:
       stat = @"ACCEPTED";
       break;
@@ -170,7 +173,9 @@
   NSString *stat;
   
   stat = [[self partStat] uppercaseString];
-  if (![stat length] || [stat isEqualToString:@"NEEDS-ACTION"])
+  if (![stat length])
+    return iCalPersonPartStatUndefined;
+  else if ([stat isEqualToString:@"NEEDS-ACTION"])
     return iCalPersonPartStatNeedsAction;
   else if ([stat isEqualToString:@"ACCEPTED"])
     return iCalPersonPartStatAccepted;