diff --git a/polytope_server/common/datasource/polytope.py b/polytope_server/common/datasource/polytope.py
index d578ac31..46b4fedb 100644
--- a/polytope_server/common/datasource/polytope.py
+++ b/polytope_server/common/datasource/polytope.py
@@ -45,6 +45,7 @@ def __init__(self, config):
         self.gh69_fix_grids = config.get("gh69_fix_grids", False)
         # https://github.com/ecmwf/polytope-server/issues/70
         self.gh70_fix_step_ranges = config.get("gh70_fix_step_ranges", False)
+        self.gh176_fix_timespan = config.get("gh176_fix_timespan", False)
         self.separate_datetime = config.get("separate_datetime", False)
         self.obey_schedule = config.get("obey_schedule", False)
         self.output = None
@@ -85,6 +86,9 @@ def retrieve(self, request):
                     if self.gh70_fix_step_ranges:
                         if k == "param":
                             pre_path[k] = v[0]
+                    if self.gh176_fix_timespan:
+                        if k == "param":
+                            pre_path[k] = v[0]
                     if len(v) == 1:
                         v = v[0]
                         pre_path[k] = v