diff --git a/src/base/remote_gdb.cc b/src/base/remote_gdb.cc
index 80dcd137b1..37ecef97ca 100644
--- a/src/base/remote_gdb.cc
+++ b/src/base/remote_gdb.cc
@@ -290,6 +290,7 @@ enum GdbBreakpointType {
     GdbAccWp = '4',
 };
 
+#ifndef NDEBUG
 const char *
 break_type(char c)
 {
@@ -302,6 +303,7 @@ break_type(char c)
       default: return "unknown breakpoint/watchpoint";
     }
 }
+#endif
 
 std::map<Addr, HardBreakpoint *> hardBreakMap;