diff --git a/bk_ch.mod b/bk_ch.mod
index 3808a5a..0c0db57 100644
--- a/bk_ch.mod
+++ b/bk_ch.mod
@@ -8,7 +8,7 @@ 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
 }
 
diff --git a/hcn12_ch.mod b/hcn12_ch.mod
index 9354429..d5ef46b 100644
--- a/hcn12_ch.mod
+++ b/hcn12_ch.mod
@@ -19,8 +19,8 @@ NEURON {
 	SUFFIX hcn12_ch
 	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 a0, b0, ah, bh, ac, bc, ba0
+	GLOBAL aah, bah, aac, bac
 	GLOBAL kon, koff, b, bf, ai, gca, shift
 }
 
diff --git a/hcn2_ch.mod b/hcn2_ch.mod
index d46e611..8d82cd7 100644
--- a/hcn2_ch.mod
+++ b/hcn2_ch.mod
@@ -23,7 +23,7 @@ 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
 }