diff --git a/pyoptmat/flowrules.py b/pyoptmat/flowrules.py
index ee05536..cd873c9 100644
--- a/pyoptmat/flowrules.py
+++ b/pyoptmat/flowrules.py
@@ -517,7 +517,7 @@ def g0(self):
         """
         The intercept value
         """
-        return (self.C_scale.scale(self.C) - self.B_scale.scale(self.B)) / self.A_scale(
+        return (self.C_scale(self.C) - self.B_scale(self.B)) / self.A_scale(
             self.A
         )
 
diff --git a/test/test_flowrules.py b/test/test_flowrules.py
index 1b8f735..ed8cc49 100644
--- a/test/test_flowrules.py
+++ b/test/test_flowrules.py
@@ -407,13 +407,18 @@ def setUp(self):
         self.eps0 = 1.0
         self.k = 1.0
 
-        self.g0 = 1.5
+        self.A = torch.tensor(-3.35)
+        self.B = torch.tensor(-3.23)
+        self.C = torch.tensor(-5.82)
+
         self.sf = 10.0
 
         self.model = flowrules.SoftKocksMeckingRegimeFlowRule(
             self.model1,
             self.model2,
-            self.g0,
+            self.A,
+            self.B,
+            self.C,
             self.mu,
             self.b,
             self.eps0,
@@ -486,13 +491,18 @@ def setUp(self):
         self.eps0 = 1.0
         self.k = 1.0
 
-        self.g0 = 1.5
+        self.A = torch.tensor(-3.35)
+        self.B = torch.tensor(-3.23)
+        self.C = torch.tensor(-5.82)
+
         self.sf = 10.0
 
         self.model = flowrules.SoftKocksMeckingRegimeFlowRule(
             self.model1,
             self.model2,
-            self.g0,
+            self.A,
+            self.B,
+            self.C,
             self.mu,
             self.b,
             self.eps0,