diff --git a/include/circ_queue.h b/include/circ_queue.h
index 2d58379..5d5b04f 100644
Binary files a/include/circ_queue.h and b/include/circ_queue.h differ
diff --git a/include/def.h b/include/def.h
index 0cac91c..3ca8066 100644
--- a/include/def.h
+++ b/include/def.h
@@ -84,7 +84,7 @@ struct pimpl {
     }
 
     constexpr void clear() {
-        clear_impl(static_cast<T*>(this));
+        clear_impl(static_cast<T*>(const_cast<pimpl*>(this)));
     }
 };
 
diff --git a/include/ipc.h b/include/ipc.h
index a2ebcfc..c2f6105 100644
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diff --git a/performence.xlsx b/performence.xlsx
index ce671a6..3f44ee0 100644
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diff --git a/src/platform/shm_win.cpp b/src/platform/shm_win.cpp
index 39fa203..2b4f612 100644
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diff --git a/test/test_ipc.cpp b/test/test_ipc.cpp
index 1d941f8..f6c1031 100644
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