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-rw-r--r--os/common/oslib/include/chmboxes.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/os/common/oslib/include/chmboxes.h b/os/common/oslib/include/chmboxes.h
index e3c16c78d..c31948296 100644
--- a/os/common/oslib/include/chmboxes.h
+++ b/os/common/oslib/include/chmboxes.h
@@ -28,6 +28,10 @@
#ifndef CHMBOXES_H
#define CHMBOXES_H
+#if !defined(CH_CFG_USE_MAILBOXES)
+#define CH_CFG_USE_MAILBOXES FALSE
+#endif
+
#if (CH_CFG_USE_MAILBOXES == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/