diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b8cb71038c..0c31ddd1d3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2019-12-02  Christian Biesinger  <cbiesinger@google.com>
+
+	* aix-thread.c (debug_aix_thread): Change type to bool.
+
 2019-12-02  Luis Machado  <luis.machado@linaro.org>
 
 	* infrun.c (follow_fork_inferior): Remove outdated FIXME comment.
diff --git a/gdb/aix-thread.c b/gdb/aix-thread.c
index ffa3352d03..35b77fe4ec 100644
--- a/gdb/aix-thread.c
+++ b/gdb/aix-thread.c
@@ -61,7 +61,7 @@ extern int getthrds (pid_t, struct thrdsinfo64 *, int, tid_t *, int);
 #endif
 
 /* Whether to emit debugging output.  */
-static int debug_aix_thread;
+static bool debug_aix_thread;
 
 /* In AIX 5.1, functions use pthdb_tid_t instead of tid_t.  */
 #ifndef PTHDB_VERSION_3