diff --git a/DisplayCAL/config.py b/DisplayCAL/config.py
index 7a8a0a20..f49c6255 100644
--- a/DisplayCAL/config.py
+++ b/DisplayCAL/config.py
@@ -1192,11 +1192,11 @@ def runtimeconfig(pyfile):
     else "u",  # Linux, OSX
     "profile.license": "Public Domain",
     "profile.load_on_login": 1,
-    "profile.name": " ".join(
+    "profile.name": "_".join(
         [
             "%dns",
             "%out",
-            "%Y-%m-%d %H-%M",
+            "%Y-%m-%d_%H-%M",
             "%cb",
             "%wp",
             "%cB",