diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 211b6a49cf9..6ac32c513ad 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-10-15  Tom Tromey  <tromey@adacore.com>
+
+	* windows-nat.c (windows_nat_target::resume): Use %x when logging
+	TID.
+
 2019-10-15  Tom Tromey  <tromey@adacore.com>
 
 	* windows-nat.c (windows_nat_target::fetch_registers)
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index df44994c95a..a756913cabf 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -1447,8 +1447,8 @@ windows_nat_target::resume (ptid_t ptid, int step, enum gdb_signal sig)
 
   last_sig = GDB_SIGNAL_0;
 
-  DEBUG_EXEC (("gdb: windows_resume (pid=%d, tid=%ld, step=%d, sig=%d);\n",
-	       ptid.pid (), ptid.tid (), step, sig));
+  DEBUG_EXEC (("gdb: windows_resume (pid=%d, tid=0x%x, step=%d, sig=%d);\n",
+	       ptid.pid (), (unsigned) ptid.tid (), step, sig));
 
   /* Get context for currently selected thread.  */
   th = thread_rec (inferior_ptid.tid (), FALSE);