diff --git a/configure.ac b/configure.ac
index 95711cb8f..4ea0bbeb8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1190,7 +1190,7 @@ fi
 AC_MSG_NOTICE([checking for header files])
 AC_HEADER_STDC
 AC_CHECK_HEADERS([string.h unistd.h langinfo.h termio.h locale.h getopt.h \
-                  pty.h utmp.h pwd.h inttypes.h signal.h])
+                  pty.h utmp.h pwd.h inttypes.h signal.h sys/select.h])
 AC_HEADER_TIME
 
 
diff --git a/tools/watchgnupg.c b/tools/watchgnupg.c
index 4f4d54db2..8ad2a13e3 100644
--- a/tools/watchgnupg.c
+++ b/tools/watchgnupg.c
@@ -34,6 +34,9 @@
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <time.h>
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
 
 #define PGM "watchgnupg"