diff --git a/cyprecice/cyprecice.pyx b/cyprecice/cyprecice.pyx
index 3766e2ed..5b64d6f5 100644
--- a/cyprecice/cyprecice.pyx
+++ b/cyprecice/cyprecice.pyx
@@ -1041,7 +1041,7 @@ cdef class Participant:
 
         return np_ids, np_coordinates.reshape((size, dimensions))
 
-    def get_version_information ():
+    def get_version_information (self):
         """
         Returns
         -------