diff --git a/mpmath/functions/zetazeros.py b/mpmath/functions/zetazeros.py
index c25fe40f..9048a844 100644
--- a/mpmath/functions/zetazeros.py
+++ b/mpmath/functions/zetazeros.py
@@ -893,6 +893,7 @@ _ROSSER_EXCEPTIONS = \
 [320822347, 320822350], '3(00)',
 [321733242, 321733245], '3(00)',
 [324413970, 324413973], '(00)3',
+[325890638, 325890641], '(00)3',
 [325950140, 325950143], '(00)3',
 [326675884, 326675887], '(00)3',
 [326704208, 326704211], '3(00)',
@@ -942,6 +943,7 @@ _ROSSER_EXCEPTIONS = \
 [356586657, 356586660], '3(00)',
 [356892926, 356892929], '(00)3',
 [356908232, 356908235], '3(00)',
+[357738762, 357738765], '(00)3',
 [357912730, 357912733], '3(00)',
 [358120344, 358120347], '3(00)',
 [359044096, 359044099], '(00)3',
diff --git a/mpmath/tests/test_extra_zeta.py b/mpmath/tests/test_extra_zeta.py
index 6b0cc9c7..b0ce3360 100644
--- a/mpmath/tests/test_extra_zeta.py
+++ b/mpmath/tests/test_extra_zeta.py
@@ -15,6 +15,15 @@ from mpmath import fp, zetazero
      (1048449116, 388858886.690745053),
      (3570918901, 1239587702.54745031),
      (3570918902, 1239587702.54752387),
+     # issue 1147, see
+     # https://www.lmfdb.org/zeros/zeta/?limit=100&N=325890640
+     # and https://www.lmfdb.org/zeros/zeta/?limit=100&N=325890640
+     (325890640, 129273228.66142665),
+     (325890641, 129273228.76005181),
+     (325890642, 129273228.79754069),
+     (357738764, 141125096.01260684),
+     (357738765, 141125096.18511831),
+     (357738766, 141125096.28064566),
      # Huge zeros (this may take hours):
 #    (8637740722917, 2124447368584.39296466152),
 #    (8637740722918, 2124447368584.39298170604),