diff --git a/python/slsdet/utils.py b/python/slsdet/utils.py
index c529f32de..9181298e5 100755
--- a/python/slsdet/utils.py
+++ b/python/slsdet/utils.py
@@ -282,5 +282,5 @@ def hostname_list(args):
 
 def validate_port(value):
     if value < 1024 or value > 65535:
-        raise ValueError("port must be in range 1 - 65535")
+        raise ValueError("port must be in range 1024 - 65535")