diff --git a/lldb/tools/debugserver/source/RNBRemote.cpp b/lldb/tools/debugserver/source/RNBRemote.cpp
index 3247e96424ed5..673328a6bd393 100644
--- a/lldb/tools/debugserver/source/RNBRemote.cpp
+++ b/lldb/tools/debugserver/source/RNBRemote.cpp
@@ -4519,12 +4519,12 @@ rnb_err_t RNBRemote::HandlePacket_qSpeedTest(const char *p) {
     return HandlePacket_ILLFORMED(
         __FILE__, __LINE__, p,
         "Didn't find response_size value at right offset");
-  else if (*end == ';') {
-    static char g_data[4 * 1024 * 1024 + 16];
-    strcpy(g_data, "data:");
-    memset(g_data + 5, 'a', response_size);
-    g_data[response_size + 5] = '\0';
-    return SendPacket(g_data);
+  else if (*end == ';' && response_size < (4 * 1024 * 1024)) {
+    std::vector<char> buf(response_size + 6, 'a');
+    memcpy(buf.data(), "data:", 5);
+    buf[buf.size() - 1] = '\0';
+    rnb_err_t return_value = SendPacket(buf.data());
+    return return_value;
   } else {
     return SendErrorPacket("E79");
   }