diff --git a/src/spicelib/devices/ltra/ltraacct.c b/src/spicelib/devices/ltra/ltraacct.c
index 4b96dcb8f..c5c07a3b1 100644
--- a/src/spicelib/devices/ltra/ltraacct.c
+++ b/src/spicelib/devices/ltra/ltraacct.c
@@ -159,6 +159,8 @@ LTRAaccept(CKTcircuit *ckt, GENmodel *inModel)
 	    return (error);
 	}
 #else
+        double dt_01, dt_12;
+
 	/*
 	 * remove the hack here - store the total inputs for the last 2 or 3
 	 * timesteps
@@ -182,18 +184,19 @@ LTRAaccept(CKTcircuit *ckt, GENmodel *inModel)
 	v6 = ckt->CKTtimeIndex < 2 ? v5 : (*(here->LTRAv2 + ckt->CKTtimeIndex - 2) +
 	    *(here->LTRAi2 + ckt->CKTtimeIndex - 2) *
 	    model->LTRAimped) * model->LTRAattenuation;
-	d1 = (v1 - v2) / (*(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex) - *(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex - 1));
-	d2 = (v2 - v3) / (*(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex - 1) - *(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex - 2));
-	d3 = (v4 - v5) / (*(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex) - *(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex - 1));
-	d4 = (v5 - v6) / (*(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex - 1) - *(ckt->CKTtimePoints +
-		ckt->CKTtimeIndex - 2));
+
+        dt_01 = (*(ckt->CKTtimePoints + ckt->CKTtimeIndex) -
+                 *(ckt->CKTtimePoints + ckt->CKTtimeIndex - 1));
+
+        dt_12 = (ckt->CKTtimeIndex < 2)
+            ? dt_01
+            : (*(ckt->CKTtimePoints + ckt->CKTtimeIndex - 1) -
+               *(ckt->CKTtimePoints + ckt->CKTtimeIndex - 2));
+
+	d1 = (v1 - v2) / dt_01;
+	d2 = (v2 - v3) / dt_12;
+	d3 = (v4 - v5) / dt_01;
+	d4 = (v5 - v6) / dt_12;
 
 	/*
 	 * here we have a big problem with the scheme boxed by the *s below.