diff --git a/fatamorgana/basic.py b/fatamorgana/basic.py
index 3c35d5e..70da126 100644
--- a/fatamorgana/basic.py
+++ b/fatamorgana/basic.py
@@ -1213,6 +1213,10 @@ class GridRepetition:
             InvalidDataError: if `b_count` and `b_vector` inputs conflict
                 with each other or if `a_count < 1`.
         """
+        a_count = int(a_count)
+        if b_count is not None:
+            b_count = int(b_count)
+
         if b_vector is None or b_count is None:
             if b_vector is not None or b_count is not None:
                 raise InvalidDataError('Repetition has only one of'