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-rw-r--r--mysys/my_seek.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mysys/my_seek.c b/mysys/my_seek.c
index 3d415400aa2..5c1a6c44b6f 100644
--- a/mysys/my_seek.c
+++ b/mysys/my_seek.c
@@ -88,6 +88,7 @@ my_off_t my_tell(File fd, myf MyFlags __attribute__((unused)))
os_off_t pos;
DBUG_ENTER("my_tell");
DBUG_PRINT("my",("Fd: %d MyFlags: %d",fd, MyFlags));
+ DBUG_ASSERT(fd >= 0);
#ifdef HAVE_TELL
pos=tell(fd);
#else