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-rw-r--r--misc/sys/param.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/misc/sys/param.h b/misc/sys/param.h
index 5e6353d1e8..d257ec7576 100644
--- a/misc/sys/param.h
+++ b/misc/sys/param.h
@@ -71,7 +71,9 @@
/* Unit of `st_blocks'. */
-#define DEV_BSIZE 512
+#ifndef DEV_BSIZE
+# define DEV_BSIZE 512
+#endif
/* Bit map related macros. */