diff --git a/hcn12_gp.mod b/hcn12_gp.mod
index f005d32..ad93e8d 100644
--- a/hcn12_gp.mod
+++ b/hcn12_gp.mod
@@ -3,7 +3,7 @@ NEURON {
 	NONSPECIFIC_CURRENT i
 	RANGE i, ehcn, g, gbar
 	GLOBAL a0, b0, ah, bh, ac, bc, aa0, ba0
-	GLOBAL aa0, ba0, aah, bah, aac, bac
+	GLOBAL aah, bah, aac, bac
 	GLOBAL kon, koff, b, bf, ai, gca, shift
 }
 
diff --git a/hcn2_gp.mod b/hcn2_gp.mod
index 5d895c3..3930567 100644
--- a/hcn2_gp.mod
+++ b/hcn2_gp.mod
@@ -3,7 +3,7 @@ NEURON {
 	NONSPECIFIC_CURRENT i
 	RANGE i, ehcn, g, gbar
 	GLOBAL a0, b0, ah, bh, ac, bc, aa0, ba0
-	GLOBAL aa0, ba0, aah, bah, aac, bac
+	GLOBAL aah, bah, aac, bac
 	GLOBAL kon, koff, b, bf, ai, gca, shift
 }