diff --git a/m4/getcwd-path-max.m4 b/m4/getcwd-path-max.m4
index 923a34c3f..a6f5c08c6 100644
--- a/m4/getcwd-path-max.m4
+++ b/m4/getcwd-path-max.m4
@@ -1,4 +1,4 @@
-#serial 3
+#serial 4
 # Check whether getcwd has the bug that it succeeds for a working directory
 # longer than PATH_MAX, yet returns a truncated directory name.
 # If so, arrange to compile the wrapper function.
@@ -11,10 +11,10 @@
 
 AC_DEFUN([GL_FUNC_GETCWD_PATH_MAX],
 [
+  AC_CHECK_DECLS([getcwd])
   AC_CACHE_CHECK([whether getcwd properly handles paths longer than PATH_MAX],
                  gl_cv_func_getcwd_vs_path_max,
   [
-  AC_CHECK_DECLS([getcwd])
   # Arrange for deletion of the temporary directory this test creates.
   ac_clean_files="$ac_clean_files confdir3"
   AC_RUN_IFELSE([AC_LANG_SOURCE([[