diff --git a/test/unittest/writertest.cpp b/test/unittest/writertest.cpp
index d8193ca..f6e023a 100644
--- a/test/unittest/writertest.cpp
+++ b/test/unittest/writertest.cpp
@@ -103,6 +103,7 @@ TEST(Writer, String) {
 TEST(Writer, Double) {
     TEST_ROUNDTRIP("[1.2345,1.2345678,0.123456789012,1234567.8]");
     TEST_ROUNDTRIP("[-0.0]"); // Issue #289
+    TEST_ROUNDTRIP("1e30");
 }
 
 TEST(Writer, Transcode) {