diff --git a/gdbserver/ax.cc b/gdbserver/ax.cc
index 213db410a07..42d28128fa6 100644
--- a/gdbserver/ax.cc
+++ b/gdbserver/ax.cc
@@ -25,7 +25,7 @@
 static void ax_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
 
 #ifdef IN_PROCESS_AGENT
-int debug_agent = 0;
+bool debug_agent = 0;
 #endif
 
 static void