diff --git a/src/fd_monitor.h b/src/fd_monitor.h
index 82a5c51c0..2c4fb0425 100644
--- a/src/fd_monitor.h
+++ b/src/fd_monitor.h
@@ -4,6 +4,8 @@
 #include <chrono>
 #include <cstdint>
 #include <functional>
+// Needed for musl
+#include <sys/select.h>  // IWYU pragma: keep
 
 #include "common.h"
 #include "maybe.h"