diff --git a/libc/stdio/findfp.c b/libc/stdio/findfp.c
index 5e51198..2696cfd 100644
--- a/libc/stdio/findfp.c
+++ b/libc/stdio/findfp.c
@@ -60,15 +60,20 @@
 _THREAD_PRIVATE_MUTEX(__sfp_mutex);
 
 static struct __sfileext __sFext[3];
+
+// __sF is exported for backwards compatibility. Until M, we didn't have symbols
+// for stdin/stdout/stderr; they were macros accessing __sF.
 FILE __sF[3] = {
 	std(__SRD, STDIN_FILENO),		/* stdin */
 	std(__SWR, STDOUT_FILENO),		/* stdout */
 	std(__SWR|__SNBF, STDERR_FILENO)	/* stderr */
 };
+
+struct glue __sglue = { &uglue, 3, __sF };
+
 FILE* stdin = &__sF[0];
 FILE* stdout = &__sF[1];
 FILE* stderr = &__sF[2];
-struct glue __sglue = { &uglue, 3, __sF };
 
 static struct glue *
 moreglue(int n)