diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index de1945aec9..19882f0447 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2017-09-05  Simon Marchi  <simon.marchi@ericsson.com>
+
+	* expprint.c (dump_subexp_body_standard): Use constant format
+	string in fprintf_filtered call.
+
 2017-09-04  John Baldwin  <jhb@FreeBSD.org>
 
 	* configure.nat: Add "x86-nat.o x86-dregs.o" for NetBSD/amd64 and
diff --git a/gdb/expprint.c b/gdb/expprint.c
index 2c16b497fc..9e04f247b6 100644
--- a/gdb/expprint.c
+++ b/gdb/expprint.c
@@ -1052,7 +1052,7 @@ dump_subexp_body_standard (struct expression *exp,
 	    if (space)
 	      fputs_filtered (" ", stream);
 	    space = true;
-	    fprintf_filtered (stream, mod);
+	    fprintf_filtered (stream, "%s", mod);
 	  };
 	if (flags & TYPE_INSTANCE_FLAG_CONST)
 	  print_one ("const");