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-rw-r--r--src/BlockTypeRegistry.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/BlockTypeRegistry.h b/src/BlockTypeRegistry.h
index 3fbcc44c2..2048105df 100644
--- a/src/BlockTypeRegistry.h
+++ b/src/BlockTypeRegistry.h
@@ -5,6 +5,7 @@
#include <map>
+#include <functional>