diff --git a/lib/__fpending.h b/lib/__fpending.h
index 01614ab04..2130c9071 100644
--- a/lib/__fpending.h
+++ b/lib/__fpending.h
@@ -3,6 +3,11 @@
 #endif
 
 #include <stdio.h>
+
+#if HAVE_STDIO_EXT_H
+# include <stdio_ext.h>
+#endif
+
 #include <sys/types.h>
 
 size_t __fpending (FILE *);