diff --git a/dart/lib/flat_buffers.dart b/dart/lib/flat_buffers.dart
index 6f307872e10..2395992ae28 100644
--- a/dart/lib/flat_buffers.dart
+++ b/dart/lib/flat_buffers.dart
@@ -386,7 +386,7 @@ class Builder {
   /// Updates the [offset] pointer.  This method is intended for use when writing structs to the buffer.
   void putFloat64(double value) {
     _prepare(_sizeofFloat64, 1);
-    _setFloat32AtTail(_tail, value);
+    _setFloat64AtTail(_tail, value);
   }
 
   /// Writes a Float32 to the tail of the buffer after preparing space for it.
diff --git a/dart/test/flat_buffers_test.dart b/dart/test/flat_buffers_test.dart
index caf2fc79a9e..83a6e2b3f1e 100644
--- a/dart/test/flat_buffers_test.dart
+++ b/dart/test/flat_buffers_test.dart
@@ -215,6 +215,10 @@ class BuilderTest {
       ..addTestarrayofstringOffset(testArrayOfString);
     final mon = monBuilder.finish();
     fbBuilder.finish(mon);
+
+    final mon3 = example.Monster(fbBuilder.buffer);
+    expect(mon3.name, 'MyMonster');
+    expect(mon3.pos!.test1, 3.0);
   }
 
   void test_error_addInt32_withoutStartTable([Builder? builder]) {