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-rw-r--r--ccan/container_of/container_of.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ccan/container_of/container_of.h b/ccan/container_of/container_of.h
index a65f4bb975..6d1a5be8ac 100644
--- a/ccan/container_of/container_of.h
+++ b/ccan/container_of/container_of.h
@@ -100,7 +100,7 @@
container_off(typeof(*var), member)
#else
#define container_off_var(var, member) \
- ((char *)&(var)->member - (char *)(var))
+ ((const char *)&(var)->member - (const char *)(var))
#endif
#endif /* CCAN_CONTAINER_OF_H */