diff --git a/litex/build/colognechip/colognechip.py b/litex/build/colognechip/colognechip.py
index ecbf59709..06e431b7b 100644
--- a/litex/build/colognechip/colognechip.py
+++ b/litex/build/colognechip/colognechip.py
@@ -91,6 +91,11 @@ class CologneChipToolchain(GenericToolchain):
         """ create project files (mainly Yosys ys file)
         """
         self._yosys.build_script()
+
+        # p_r complains about missing cc_worst_spd_dly.dly -> copy it in gateware directory
+        p_r_path              = which("p_r")
+        cc_worst_spd_dly_path = os.path.join(os.path.dirname(p_r_path), "cc_worst_spd_dly.dly")
+        copyfile(cc_worst_spd_dly_path, os.path.join(self._build_dir, "cc_worst_spd_dly.dly"))
  
     # Script ---------------------------------------------------------------------------------------