diff --git a/lbry/wallet/header.py b/lbry/wallet/header.py
index 2fa066cdf..fd5a85c61 100644
--- a/lbry/wallet/header.py
+++ b/lbry/wallet/header.py
@@ -136,6 +136,8 @@ class Headers:
             raise IndexError(f"failed to get {height}, at {len(self)}")
 
     def estimated_timestamp(self, height):
+        if height <= 0:
+            return
         return int(self.first_block_timestamp + (height * self.timestamp_average_offset))
 
     def estimated_julian_day(self, height):
diff --git a/tests/unit/wallet/test_headers.py b/tests/unit/wallet/test_headers.py
index 5ebb333c3..e014f6e46 100644
--- a/tests/unit/wallet/test_headers.py
+++ b/tests/unit/wallet/test_headers.py
@@ -147,6 +147,12 @@ class TestHeaders(AsyncioTestCase):
         await headers.repair(start_height=10)
         self.assertEqual(19, headers.height)
 
+    def test_do_not_estimate_unconfirmed(self):
+        headers = Headers(':memory:')
+        self.assertIsNone(headers.estimated_timestamp(-1))
+        self.assertIsNone(headers.estimated_timestamp(0))
+        self.assertIsNotNone(headers.estimated_timestamp(1))
+
     async def test_misalignment_triggers_repair_on_open(self):
         headers = Headers(':memory:')
         headers.io.seek(0)