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-rw-r--r--src/lib/entropy/proc_walk/proc_walk.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/entropy/proc_walk/proc_walk.h b/src/lib/entropy/proc_walk/proc_walk.h
index 218cd752a..079fdc2cd 100644
--- a/src/lib/entropy/proc_walk/proc_walk.h
+++ b/src/lib/entropy/proc_walk/proc_walk.h
@@ -9,6 +9,7 @@
#define BOTAN_ENTROPY_SRC_PROC_WALK_H__
#include <botan/entropy_src.h>
+#include <mutex>
namespace Botan {