diff --git a/gcc/genmatch.cc b/gcc/genmatch.cc
index 3ba6139e12dac2a041ba79e26767e39574c31137..b9a792e245542ab1d785c188cf0733f6e29ea2b5 100644
--- a/gcc/genmatch.cc
+++ b/gcc/genmatch.cc
@@ -890,8 +890,8 @@ define_dump_logs (bool gimple, FILE *f)
 
   for (unsigned i = 0; i < dbg_line_numbers.length () - 1; i++)
     {
-      if (i % 20 == 0)
-	fprintf (f, "\n\t");
+      if (i % 10 == 0)
+	fprintf (f, "\n\t/* %d */ ", i);
 
       fprintf (f, "%d, ", dbg_line_numbers[i]);
     }