diff --git a/src/core/hip_act_cb_tracker.h b/src/core/hip_act_cb_tracker.h
deleted file mode 100644
index a3ed2c6f13..0000000000
--- a/src/core/hip_act_cb_tracker.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Copyright (c) 2018-2022 Advanced Micro Devices, Inc.
-
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
-
- The above copyright notice and this permission notice shall be included in
- all copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- THE SOFTWARE. */
-
-#ifndef CORE_HIP_ACT_CB_TRACKER_H_
-#define CORE_HIP_ACT_CB_TRACKER_H_
-
-#include <map>
-
-namespace roctracer {
-enum { API_CB_MASK = 0x1, ACT_CB_MASK = 0x2 };
-
-class hip_act_cb_tracker_t {
- private:
-  std::map<uint32_t, uint32_t> data;
-
- public:
-  uint32_t enable_check(uint32_t op, uint32_t mask) { return data[op] |= mask; }
-
-  uint32_t disable_check(uint32_t op, uint32_t mask) { return data[op] &= ~mask; }
-};  // hip_act_cb_tracker_t
-};  // namespace roctracer
-
-#endif  // CORE_HIP_ACT_CB_TRACKER_H_
diff --git a/src/core/roctracer.cpp b/src/core/roctracer.cpp
index 92bcf7631c..c9e4103a67 100644
--- a/src/core/roctracer.cpp
+++ b/src/core/roctracer.cpp
@@ -35,8 +35,8 @@
 #include <atomic>
 #include <mutex>
 #include <stack>
+#include <unordered_map>
 
-#include "core/hip_act_cb_tracker.h"
 #include "core/journal.h"
 #include "core/loader.h"
 #include "core/memory_pool.h"
@@ -222,6 +222,17 @@ bool act_en_functor_t::operator()(activity_domain_t domain, uint32_t op, Data&&
   return true;
 }
 
+enum { API_CB_MASK = 0x1, ACT_CB_MASK = 0x2 };
+
+class hip_act_cb_tracker_t {
+ public:
+  uint32_t enable_check(uint32_t op, uint32_t mask) { return data_[op] |= mask; }
+  uint32_t disable_check(uint32_t op, uint32_t mask) { return data_[op] &= ~mask; }
+
+ private:
+  std::unordered_map<uint32_t, uint32_t> data_;
+};
+
 void hsa_async_copy_handler(::proxy::Tracker::entry_t* entry);
 void hsa_kernel_handler(::proxy::Tracker::entry_t* entry);
 constexpr TraceBuffer<trace_entry_t>::flush_prm_t trace_buffer_prm[] = {