diff --git a/src/ciderlib/twod/twoproj.c b/src/ciderlib/twod/twoproj.c
index a2a9c7c1a..1905a1bd3 100644
--- a/src/ciderlib/twod/twoproj.c
+++ b/src/ciderlib/twod/twoproj.c
@@ -153,7 +153,7 @@ void NBJT2project(TWOdevice *pDevice, double delVce, double delVbe)
 	      }
 	    }
 	    if ( pElem->elemType == SEMICON
-		&& (!OneCarrier | (OneCarrier == P_TYPE)) ) {
+		&& (!OneCarrier || (OneCarrier == P_TYPE)) ) {
 	      delP = incVce[ pNode->pEqn ] * delVce;
 	      newP = pNode->pConc + delP;
 	      if ( newP <= 0.0 ) {