diff --git a/coverage/jsonreport.py b/coverage/jsonreport.py
index 7ca468e32..3afae2ccd 100644
--- a/coverage/jsonreport.py
+++ b/coverage/jsonreport.py
@@ -115,4 +115,4 @@ def _convert_branch_arcs(branch_arcs):
     """Convert branch arcs to a list of two-element tuples."""
     for source, targets in branch_arcs.items():
         for target in targets:
-            yield source, target if target != -1 else 0
+            yield source, target
diff --git a/tests/test_json.py b/tests/test_json.py
index 7205c284c..9bb69bf25 100644
--- a/tests/test_json.py
+++ b/tests/test_json.py
@@ -55,7 +55,7 @@ def test_branch_coverage(self):
                     'executed_branches': [
                         [2, 4],
                         [4, 5],
-                        [8, 0],
+                        [8, -1],
                     ],
                     'missing_branches': [
                         [2, 3],