diff --git a/include/boost/stacktrace/detail/backtrace_holder_windows.hpp b/include/boost/stacktrace/detail/backtrace_holder_windows.hpp
index 3a14639..533dbe5 100644
--- a/include/boost/stacktrace/detail/backtrace_holder_windows.hpp
+++ b/include/boost/stacktrace/detail/backtrace_holder_windows.hpp
@@ -129,7 +129,7 @@ struct backtrace_holder {
         if (!try_init_com(idebug_)) {
             return result;
         }
-        ULONG64 offset = buffer[frame]);
+        ULONG64 offset = reinterpret_cast<ULONG64>(buffer[frame]);
 
         char name[256];
         name[0] = 0;