diff --git a/sharq/utils.py b/sharq/utils.py
index 2af8361..a05bdfb 100644
--- a/sharq/utils.py
+++ b/sharq/utils.py
@@ -35,7 +35,7 @@ def is_valid_interval(interval):
     if not isinstance(interval, int):
         return False
 
-    if interval <= 0:
+    if interval < 0:
         return False
 
     return True