diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index e57137f..ae57aa3 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -1287,7 +1287,7 @@
     MethodHelper mh(m);
     expandBufAddMethodId(pReply, ToMethodId(m));
     expandBufAddUtf8String(pReply, mh.GetName());
-    expandBufAddUtf8String(pReply, mh.GetSignature());
+    expandBufAddUtf8String(pReply, mh.GetSignature().ToString());
     if (with_generic) {
       static const char genericSignature[1] = "";
       expandBufAddUtf8String(pReply, genericSignature);