commit - 1c2d4cc9a3b08873d8a8dd63731b68eab87b6b03
commit + 19fad31f2f7cceb234a814c262dbba796b36af97
blob - e3ff3471259d8b552c269af649f1db0869b5778a
blob + 8669ed2d4c4cc6546d4d8febdcaad9c408054d47
--- lib/diff_myers.c
+++ lib/diff_myers.c
@@ -316,13 +316,15 @@ diff_divide_myers_forward(bool *found_midpoint,
 			debug("  down %d similar lines\n", x - x_before_slide);
 		}
 
-		if (DEBUG) {
+#if DEBUG
+		{
 			int fi;
 			for (fi = d; fi >= k; fi--) {
 				debug("kd_forward[%d] = (%d, %d)\n", fi,
 				      kd_forward[fi], kd_forward[fi] - fi);
 			}
 		}
+#endif
 
 		if (x < 0 || x > left->atoms.len
 		    || xk_to_y(x, k) < 0 || xk_to_y(x, k) > right->atoms.len)