diff --git a/gateware/linien_module.py b/gateware/linien_module.py
index a64714c..1d905de 100644
--- a/gateware/linien_module.py
+++ b/gateware/linien_module.py
@@ -47,7 +47,7 @@ from .lowlevel.scopegen import ScopeGen
 
 
 class LinienLogic(Module, AutoCSR):
-    def __init__(self, width=14, signal_width=25, chain_factor_width=8, coeff_width=25):
+    def __init__(self, width=14, signal_width=25, chain_factor_width=8, coeff_width=18):
         self.init_csr(width, chain_factor_width)
         self.init_submodules(width, signal_width)
         self.connect_pid()
@@ -154,7 +154,7 @@ class LinienModule(Module, AutoCSR):
     def __init__(self, soc):
         width = 14
         signal_width = 25
-        coeff_width = 25
+        coeff_width = 18
         chain_factor_bits = 8
 
         self.init_submodules(