diff --git a/src/lib/nfs/Connection.cxx b/src/lib/nfs/Connection.cxx
index 4c2f523f6..a2f0cbb45 100644
--- a/src/lib/nfs/Connection.cxx
+++ b/src/lib/nfs/Connection.cxx
@@ -32,6 +32,8 @@ extern "C" {
 
 #include <utility>
 
+#include <poll.h> /* for POLLIN, POLLOUT */
+
 inline bool
 NfsConnection::CancellableCallback::Open(nfs_context *ctx,
 					 const char *path, int flags,