diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog
index 43b8bc895d..4ed5d61016 100644
--- a/gdbserver/ChangeLog
+++ b/gdbserver/ChangeLog
@@ -1,3 +1,7 @@
+2020-06-29  Tom de Vries  <tdevries@suse.de>
+
+	* ax.h: Include gdbsupport/debug_agent.h.
+
 2020-06-23  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* tdesc.cc (struct tdesc_compatible_info): New struct.
diff --git a/gdbserver/ax.h b/gdbserver/ax.h
index 1fba69e7ad..b7ff7d8910 100644
--- a/gdbserver/ax.h
+++ b/gdbserver/ax.h
@@ -22,6 +22,7 @@
 #include "regcache.h"
 
 #ifdef IN_PROCESS_AGENT
+#include "gdbsupport/agent.h"
 #define debug_threads debug_agent
 #endif