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--- a/src/utils/rclutil.cpp
+++ b/src/utils/rclutil.cpp
@@ -263,7 +263,7 @@
     // mkdir. try to make sure that we at least don't shoot ourselves
     // in the foot
     static std::mutex mmutex;
-    std::unique_lock lock(mmutex);
+    std::unique_lock<std::mutex> lock(mmutex);
     tdir = path_wingettempfilename(TEXT("rcltmp"));
 #endif