diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index 5590b9be6..3d64ca906 100644
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,4 +1,4 @@
-#serial 12
+#serial 13
 
 dnl From Jim Meyering.
 dnl Check for the nanosleep function.
@@ -68,4 +68,5 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
 AC_DEFUN([gl_PREREQ_NANOSLEEP],
 [
   AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_CHECK_FUNCS_ONCE(siginterrupt)
 ])