diff --git a/appl/popper/popper.h b/appl/popper/popper.h
index 5b8aef9c6..c1aeb0cdd 100644
--- a/appl/popper/popper.h
+++ b/appl/popper/popper.h
@@ -79,6 +79,9 @@
 #ifdef HAVE_SYSLOG_H
 #include <syslog.h>
 #endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
 #include "version.h"
 
 #include <err.h>