diff --git a/src/fdb5/database/Key.h b/src/fdb5/database/Key.h
index 54c94f88b..76672e3f4 100644
--- a/src/fdb5/database/Key.h
+++ b/src/fdb5/database/Key.h
@@ -20,6 +20,7 @@
 #include <string>
 #include <vector>
 #include <set>
+#include <memory>
 
 #include "eckit/types/Types.h"
 
diff --git a/src/fdb5/rules/Rule.h b/src/fdb5/rules/Rule.h
index beef3e5ea..ba6867905 100644
--- a/src/fdb5/rules/Rule.h
+++ b/src/fdb5/rules/Rule.h
@@ -18,6 +18,7 @@
 
 #include <iosfwd>
 #include <vector>
+#include <memory>
 
 #include "eckit/memory/NonCopyable.h"
 #include "eckit/types/Types.h"
diff --git a/src/fdb5/rules/Schema.h b/src/fdb5/rules/Schema.h
index b0cc9d1e4..5b5740716 100644
--- a/src/fdb5/rules/Schema.h
+++ b/src/fdb5/rules/Schema.h
@@ -18,6 +18,7 @@
 
 #include <iosfwd>
 #include <vector>
+#include <memory>
 
 #include "eckit/exception/Exceptions.h"
 #include "eckit/filesystem/PathName.h"