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-rw-r--r--ext/rtree/rtree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/rtree/rtree.c b/ext/rtree/rtree.c
index d8567b65a..f7d3bda01 100644
--- a/ext/rtree/rtree.c
+++ b/ext/rtree/rtree.c
@@ -97,7 +97,7 @@ typedef unsigned int u32;
# define NEVER(X) (X)
#endif
#ifndef offsetof
-#define offsetof(STRUCTURE,FIELD) ((size_t)((char*)&((STRUCTURE*)0)->FIELD))
+# define offsetof(ST,M) ((size_t)((char*)&((ST*)0)->M - (char*)0))
#endif
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define FLEXARRAY