diff --git a/tests/utests/basic/test_json.c b/tests/utests/basic/test_json.c
index f17ea2e..b6db947 100644
--- a/tests/utests/basic/test_json.c
+++ b/tests/utests/basic/test_json.c
@@ -132,6 +132,10 @@
     assert_int_equal(1, jsonctx->dynamic);
     lyjson_ctx_free(jsonctx);
 
+    str = "1E1000";
+    assert_non_null(ly_in_memory(in, str));
+    assert_int_equal(LY_EVALID, lyjson_ctx_new(UTEST_LYCTX, in, &jsonctx));
+
     /* exp fraction number */
     str = "1.1e3";
     assert_non_null(ly_in_memory(in, str));