diff --git a/src/include/ngspice/devdefs.h b/src/include/ngspice/devdefs.h
index f9b89f989..8668a8d4f 100644
--- a/src/include/ngspice/devdefs.h
+++ b/src/include/ngspice/devdefs.h
@@ -146,6 +146,7 @@ extern int        DEVmaxnum;    /* size of DEVices array */
 # define IOPA(a,b,c,d)  { a, b, c|IF_SET|IF_ASK|IF_AC,			d }
 # define IOPAU(a,b,c,d) { a, b, c|IF_SET|IF_ASK|IF_AC|IF_UNINTERESTING,d }
 # define IOPAP(a,b,c,d) { a, b, c|IF_SET|IF_ASK|IF_AC|IF_PRINCIPAL,	d }
+# define IOPAPR(a,b,c,d) { a, b, c|IF_SET|IF_ASK|IF_AC|IF_PRINCIPAL|IF_REDUNDANT, d }
 # define IOPAA(a,b,c,d) { a, b, c|IF_SET|IF_ASK|IF_AC_ONLY,		d }
 # define IOPAAU(a,b,c,d) { a, b, c|IF_SET|IF_ASK|IF_AC_ONLY|IF_UNINTERESTING,d}
 # define IOPPA(a,b,c,d) { a, b, c|IF_SET|IF_ASK|IF_AC_ONLY|IF_PRINCIPAL, d }
diff --git a/src/spicelib/devices/cap/cap.c b/src/spicelib/devices/cap/cap.c
index 9a3c69b49..2b4b3e345 100644
--- a/src/spicelib/devices/cap/cap.c
+++ b/src/spicelib/devices/cap/cap.c
@@ -11,8 +11,8 @@ Modified: September 2003 - Paolo Nenzi
 
 IFparm CAPpTable[] = { /* parameters */
     IOPAP("capacitance", CAP_CAP,             IF_REAL, "Device capacitance"),
-    IOPAP("cap",         CAP_CAP,             IF_REAL, "Device capacitance"),
-    IOPAP("c",           CAP_CAP,             IF_REAL, "Device capacitance"),
+    IOPAPR("cap",        CAP_CAP,             IF_REAL, "Device capacitance"),
+    IOPAPR("c",          CAP_CAP,             IF_REAL, "Device capacitance"),
     IOPAU("ic",          CAP_IC,              IF_REAL, "Initial capacitor voltage"),
     IOPZU("temp",        CAP_TEMP,            IF_REAL, "Instance operating temperature"),
     IOPZ( "dtemp",       CAP_DTEMP,           IF_REAL,