diff --git a/reader_concurrency_semaphore.hh b/reader_concurrency_semaphore.hh
index d8e12e6dc6..8cecb290f0 100644
--- a/reader_concurrency_semaphore.hh
+++ b/reader_concurrency_semaphore.hh
@@ -12,6 +12,7 @@
 #include <seastar/core/future.hh>
 #include <seastar/core/gate.hh>
 #include <seastar/core/queue.hh>
+#include <seastar/core/expiring_fifo.hh>
 #include "reader_permit.hh"
 #include "flat_mutation_reader_v2.hh"
 
diff --git a/seastar b/seastar
index ea6a6820ed..2849a8a8ba 160000
--- a/seastar
+++ b/seastar
@@ -1 +1 @@
-Subproject commit ea6a6820ede9995cbfc6037e430b8d733a088c8f
+Subproject commit 2849a8a8bac05199d237f91ec9a6edfcf7801df7