diff --git a/litex/build/generic_platform.py b/litex/build/generic_platform.py
index 6d95d5ff3..96fe8bc8e 100644
--- a/litex/build/generic_platform.py
+++ b/litex/build/generic_platform.py
@@ -155,7 +155,10 @@ class ConnectorManager:
         r = []
         for identifier in identifiers:
             if ":" in identifier:
-                conn, pn = identifier.split(":")
+                try:
+                    conn, pn = identifier.split(":")
+                except ValueError as err:
+                    raise ValueError(f"\"{identifier}\" {err}") from err
                 if pn.isdigit():
                     pn = int(pn)