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-rw-r--r--file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/file.c b/file.c
index cd87d8d..d0aaaf8 100644
--- a/file.c
+++ b/file.c
@@ -3259,7 +3259,7 @@ rb_file_truncate(obj, len)
f = GetWriteFile(fptr);
fflush(f);
fseeko(f, (off_t)0, SEEK_CUR);
-#ifdef HAVE_TRUNCATE
+#ifdef HAVE_FTRUNCATE
if (ftruncate(fileno(f), pos) < 0)
rb_sys_fail(fptr->path);
#else