diff --git a/src/frontend/outitf.c b/src/frontend/outitf.c
index adde34a8e..963dd4bfb 100644
--- a/src/frontend/outitf.c
+++ b/src/frontend/outitf.c
@@ -749,7 +749,7 @@ OUTpData(runDesc *plotPtr, IFvalue *refValue, IFvalue *valuePtr)
 
 
 
-int OUTwReference(void *plotPtr, IFvalue *valuePtr, void **refPtr)
+int OUTwReference(runDesc*plotPtr, IFvalue *valuePtr, void **refPtr)
 {
     NG_IGNORE(refPtr);
     NG_IGNORE(valuePtr);
diff --git a/src/frontend/outitf.h b/src/frontend/outitf.h
index cca3f3f9f..07853146b 100644
--- a/src/frontend/outitf.h
+++ b/src/frontend/outitf.h
@@ -55,7 +55,7 @@ int OUTwBeginPlot(CKTcircuit *circuitPtr, JOB *analysisPtr,
                   IFuid refName, int refType,
                   int numNames, IFuid *dataNames, int dataType, runDesc **plotPtr);
 int OUTpData(runDesc *plotPtr, IFvalue *refValue, IFvalue *valuePtr);
-int OUTwReference(void *plotPtr, IFvalue *valuePtr, void **refPtr);
+int OUTwReference(runDesc *plotPtr, IFvalue *valuePtr, void **refPtr);
 int OUTwData(runDesc *plotPtr, int dataIndex, IFvalue *valuePtr, void *refPtr);
 int OUTwEnd(runDesc *plotPtr);
 int OUTendPlot(runDesc *plotPtr);