diff --git a/src/frontend/circuits.c b/src/frontend/circuits.c
index 6246dfcda..636291eaa 100644
--- a/src/frontend/circuits.c
+++ b/src/frontend/circuits.c
@@ -22,8 +22,8 @@ struct circ *ft_circuits = NULL;
 /* Add a circuit to the circuit list */
 
 void
-ft_newcirc(struct circ *ckt)
+ft_newcirc(struct circ *ci)
 {
-    ckt->ci_next = ft_circuits;
-    ft_circuits = ckt;
+    ci->ci_next = ft_circuits;
+    ft_circuits = ci;
 }
diff --git a/src/include/ngspice/fteext.h b/src/include/ngspice/fteext.h
index 2e8d01df4..390ff04dc 100644
--- a/src/include/ngspice/fteext.h
+++ b/src/include/ngspice/fteext.h
@@ -43,7 +43,7 @@ extern int ft_getSaves(struct save_info **);
 extern struct circ *ft_curckt;
 extern struct circ *ft_circuits;
 extern struct subcirc *ft_subcircuits;
-extern void ft_newcirc(struct circ *ckt);
+extern void ft_newcirc(struct circ *ci);
 
 /* clip.c */
 
diff --git a/src/main.c b/src/main.c
index dbaf372a9..214b72a08 100644
--- a/src/main.c
+++ b/src/main.c
@@ -331,12 +331,12 @@ if_setparam(CKTcircuit *ckt, char **name, char *param, struct dvec *val, int do_
 
 /* -------------------------------------------------------------------------- */
 bool
-if_tranparams(struct circ *ckt, double *start, double *stop, double *step)
+if_tranparams(struct circ *ci, double *start, double *stop, double *step)
 {
     NG_IGNORE(step);
     NG_IGNORE(stop);
     NG_IGNORE(start);
-    NG_IGNORE(ckt);
+    NG_IGNORE(ci);
 
     return FALSE;
 }