diff --git a/spice/generic/varistor.lib b/spice/generic/varistor.lib
index a513108..d29650b 100644
--- a/spice/generic/varistor.lib
+++ b/spice/generic/varistor.lib
@@ -4,6 +4,6 @@
 */////////////////////////////////////////////////////////////////////
 .SUBCKT VARISTOR IN_P IN_N R_P R_N PARAMS: gain=1
 */////////////////////////////////////////////////////
-R R_P R_N {abs(V(IN_P) - V(IN_N)) * gain + 1n}
+R R_P R_N {(V(IN_P) - V(IN_N)) * gain + 1n}
 .ENDS
 * END MODEL VARISTOR