diff --git a/ChangeLog b/ChangeLog
index 7f52aac59..8ccdfb1ea 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,8 @@
 
 	* src/parse.c (parse_array_assignment):  Memory leak.
 
+	* src/interpol.c:  Dead code.
+
 2017-09-18  Ethan A Merritt  <merritt@u.washington.edu>
 
 	* src/datafile.c (f_columnhead df_set_key_title) src/datafile.h
diff --git a/src/interpol.c b/src/interpol.c
index f2dd394e1..a9bbd7fa2 100644
--- a/src/interpol.c
+++ b/src/interpol.c
@@ -1,5 +1,5 @@
 #ifndef lint
-static char *RCSid() { return RCSid("$Id: interpol.c,v 1.63 2017-08-24 23:32:42 sfeam Exp $"); }
+static char *RCSid() { return RCSid("$Id: interpol.c,v 1.64 2017-09-20 01:42:34 sfeam Exp $"); }
 #endif
 
 /* GNUPLOT - interpol.c */
@@ -887,14 +887,9 @@ do_cubic(
 	/* Evaluate cubic spline polynomial */
 	y = ((sc[l][3] * temp + sc[l][2]) * temp + sc[l][1]) * temp + sc[l][0];
 
-	/* With logarithmic y axis, we need to convert from linear to
-         * log scale now. */
-	if (Y_AXIS.log) {
-	    if (y > 0.)
-		y = y;
-	    else
+	/* With logarithmic y axis, we need to convert from linear to log scale now */
+	if (Y_AXIS.log && y <= 0)
 		y = symin - (symax - symin);
-	}
 
 	dest[i].type = INRANGE;
 	STORE_AND_FIXUP_RANGE(dest[i].x, x, dest[i].type, ixmin, ixmax, X_AXIS.autoscale);