diff --git a/src/obidmscolumn.c b/src/obidmscolumn.c
index 0622070..e02abb4 100755
--- a/src/obidmscolumn.c
+++ b/src/obidmscolumn.c
@@ -1280,7 +1280,7 @@ OBIDMS_column_p obi_open_column(OBIDMS_p     dms,
 	if (column_file_descriptor < 0)
 	{
 		obi_set_errno(OBICOL_UNKNOWN_ERROR);
-		obidebug(1, "\nError opening column file");
+		obidebug(1, "\nError opening column file %s", column_file_name);
 		free(column_file_name);
 		return NULL;
 	}