diff --git a/lib/services/caldav-sync.ts b/lib/services/caldav-sync.ts
index 7af7a70..48c2648 100644
--- a/lib/services/caldav-sync.ts
+++ b/lib/services/caldav-sync.ts
@@ -91,7 +91,9 @@ export async function discoverInfomaniakCalendars(
 
         // Check if this is actually a calendar (has <c:calendar> in resourcetype)
         // Try multiple patterns to be more flexible with XML namespaces
-        const dataStr = props.data || '';
+        // Handle both Response and ResponseDataDetailed types
+        const propsData = (props as any).data || '';
+        const dataStr = typeof propsData === 'string' ? propsData : '';
         const isCalendar = dataStr.includes('<c:calendar') || 
                           dataStr.includes('calendar') ||
                           dataStr.includes('urn:ietf:params:xml:ns:caldav');
@@ -99,7 +101,7 @@ export async function discoverInfomaniakCalendars(
         logger.debug('[CALDAV] Calendar check result', {
           filename: item.filename,
           isCalendar,
-          hasData: !!props.data,
+          hasData: !!propsData,
           dataLength: dataStr.length,
         });
         
@@ -109,8 +111,8 @@ export async function discoverInfomaniakCalendars(
         }
 
         // Parse XML response to extract calendar name and color
-        const displayName = extractDisplayName(props.data);
-        const color = extractCalendarColor(props.data);
+        const displayName = extractDisplayName(dataStr);
+        const color = extractCalendarColor(dataStr);
 
         const calendar = {
           id: item.filename.replace(/^\//, '').replace(/\/$/, ''),