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-rw-r--r--extmod/modbtree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extmod/modbtree.c b/extmod/modbtree.c
index 127dd71a39..229daaf0f9 100644
--- a/extmod/modbtree.c
+++ b/extmod/modbtree.c
@@ -26,7 +26,7 @@
#include <stdio.h>
#include <string.h>
-#include <errno.h>
+#include <errno.h> // for declaration of global errno variable
#include <fcntl.h>
#include "py/nlr.h"