diff --git a/mod/bk_gp.mod b/mod/bk_gp.mod
index b0c4d49..b0405d0 100755
--- a/mod/bk_gp.mod
+++ b/mod/bk_gp.mod
@@ -5,7 +5,7 @@ NEURON {
 	RANGE gbar, ik
 	GLOBAL minf, mtau, hinf, htau, zinf, ztau
 	GLOBAL m_vh, m_k, mtau_y0, mtau_vh1, mtau_vh2, mtau_k1, mtau_k2
-	GLOBAL z_coef, ztau
+	GLOBAL z_coef
 	GLOBAL h_y0, h_vh, h_k, htau_y0, htau_vh1, htau_vh2, htau_k1, htau_k2
 	GLOBAL Cq10
 }
diff --git a/mod/hcn12_gp.mod b/mod/hcn12_gp.mod
index b61c69d..2574f8c 100755
--- a/mod/hcn12_gp.mod
+++ b/mod/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/mod/hcn2_gp.mod b/mod/hcn2_gp.mod
index f5bab47..36390aa 100755
--- a/mod/hcn2_gp.mod
+++ b/mod/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
 }