1 files changed, 3 insertions, 2 deletions
diff --git a/Modules/_json.c b/Modules/_json.c
index 6879ad3..fa8e2a9 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1319,9 +1319,10 @@ encoder_encode_float(PyEncoderObject *s, PyObject *obj)
     double i = PyFloat_AS_DOUBLE(obj);
     if (!Py_IS_FINITE(i)) {
         if (!s->allow_nan) {
-            PyErr_SetString(
+            PyErr_Format(
                     PyExc_ValueError,
-                    "Out of range float values are not JSON compliant"
+                    "Out of range float values are not JSON compliant: %R",
+                    obj
                     );
             return NULL;
         }