diff --git a/src/maths/ni/niconv.c b/src/maths/ni/niconv.c
index 9c70b8120..c147caf43 100644
--- a/src/maths/ni/niconv.c
+++ b/src/maths/ni/niconv.c
@@ -33,7 +33,7 @@ NIconvTest(CKTcircuit *ckt)
     for (i=1;i<=size;i++) {
         new =  ckt->CKTrhs [i] ;
         old =  ckt->CKTrhsOld [i] ;
-	printf("chk for convergence:   %s    new: %g    old: %g\n",CKTnodName(ckt,i),new,old);
+        printf("chk for convergence:   %s    new: %g    old: %g\n",CKTnodName(ckt,i),new,old);
     }
 #endif /* STEPDEBUG */
     for (i=1;i<=size;i++) {
@@ -51,10 +51,10 @@ NIconvTest(CKTcircuit *ckt)
             if (fabs(new-old) >tol ) {
 #ifdef STEPDEBUG
                 printf(" non-convergence at node (type=3) %s (fabs(new-old)>tol --> fabs(%g-%g)>%g)\n",CKTnodName(ckt,i),new,old,tol);
-		printf("    reltol: %g    voltTol: %g   (tol=reltol*(MAX(fabs(old),fabs(new))) + voltTol)\n",ckt->CKTreltol,ckt->CKTvoltTol);
+                printf("    reltol: %g    voltTol: %g   (tol=reltol*(MAX(fabs(old),fabs(new))) + voltTol)\n",ckt->CKTreltol,ckt->CKTvoltTol);
 #endif /* STEPDEBUG */
-		ckt->CKTtroubleNode = i;
-		ckt->CKTtroubleElt = NULL;
+                ckt->CKTtroubleNode = i;
+                ckt->CKTtroubleElt = NULL;
                 return(1);
             }
         } else {
@@ -63,10 +63,10 @@ NIconvTest(CKTcircuit *ckt)
             if (fabs(new-old) >tol ) {
 #ifdef STEPDEBUG
                 printf(" non-convergence at node (type=%d) %s (fabs(new-old)>tol --> fabs(%g-%g)>%g)\n",node->type,CKTnodName(ckt,i),new,old,tol);
-		printf("    reltol: %g    abstol: %g   (tol=reltol*(MAX(fabs(old),fabs(new))) + abstol)\n",ckt->CKTreltol,ckt->CKTabstol);
+                printf("    reltol: %g    abstol: %g   (tol=reltol*(MAX(fabs(old),fabs(new))) + abstol)\n",ckt->CKTreltol,ckt->CKTabstol);
 #endif /* STEPDEBUG */
-		ckt->CKTtroubleNode = i;
-		ckt->CKTtroubleElt = NULL;
+                ckt->CKTtroubleNode = i;
+                ckt->CKTtroubleElt = NULL;
                 return(1);
             }
         }