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-rw-r--r--ports/ARM7/chcore.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ports/ARM7/chcore.h b/ports/ARM7/chcore.h
index a92ed5512..e2c6481b5 100644
--- a/ports/ARM7/chcore.h
+++ b/ports/ARM7/chcore.h
@@ -128,7 +128,7 @@ struct context {
/**
* Enforces a correct alignment for a stack area size value.
*/
-#define STACK_ALIGN(n) ((((n) - 1) | sizeof(stkalign_t)) + 1)
+#define STACK_ALIGN(n) ((((n) - 1) | (sizeof(stkalign_t) - 1)) + 1)
/**
* Computes the thread working area global size.