diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5f4577d47358..236d40dd36a8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-06  Jakub Jelinek  <jakub@redhat.com>
+
+	* read-rtl.c (rtx_reader::read_rtx_code): Avoid -Wsign-compare
+	warning.
+
 2017-01-06  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
 	* config/arm/arm.md (<mcrr>): New.
diff --git a/gcc/read-rtl.c b/gcc/read-rtl.c
index e9c806828003..2a8650b3afa2 100644
--- a/gcc/read-rtl.c
+++ b/gcc/read-rtl.c
@@ -1255,7 +1255,7 @@ rtx_reader::read_rtx_code (const char *code_name)
   if (strcmp (code_name, "reuse_rtx") == 0)
     {
       read_name (&name);
-      long idx = atoi (name.string);
+      unsigned idx = atoi (name.string);
       /* Look it up by ID.  */
       gcc_assert (idx < m_reuse_rtx_by_id.length ());
       return_rtx = m_reuse_rtx_by_id[idx];