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-rw-r--r--test/ohdr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ohdr.c b/test/ohdr.c
index afcea87..d28b11e 100644
--- a/test/ohdr.c
+++ b/test/ohdr.c
@@ -541,7 +541,7 @@ test_unknown(unsigned bogus_id, char *filename, hid_t fapl)
done in the source directory. */
HDstrncpy(testfile, FILE_BOGUS, TESTFILE_LEN);
testfile[TESTFILE_LEN - 1] = '\0';
- HDstrncat(testfile, ".copy", 5);
+ HDstrncat(testfile, ".copy", sizeof(testfile) - HDstrlen(testfile) - 1);
/* Make a copy of the data file from svn. */
if (h5_make_local_copy(FILE_BOGUS, testfile) < 0)