diff --git a/configure.in b/configure.in
index 8e402246f..494c27181 100644
--- a/configure.in
+++ b/configure.in
@@ -285,6 +285,7 @@ AC_CHECK_HEADERS([\
 	netinet6/in6.h				\
 	netinfo/ni.h				\
 	paths.h					\
+	pthread.h				\
 	pty.h					\
 	pwd.h					\
 	resolv.h				\