diff --git a/tests/test_builder.cpp b/tests/test_builder.cpp
index ae67076..047a380 100644
--- a/tests/test_builder.cpp
+++ b/tests/test_builder.cpp
@@ -117,6 +117,9 @@
   return verify(buf, expected_name, color);
 }
 
+// forward-declared in test.cpp
+void FlatBufferBuilderTest();
+
 void FlatBufferBuilderTest() {
   using flatbuffers::FlatBufferBuilder;
 
@@ -138,5 +141,8 @@
       TestSelector(tests, tests + 4));
 }
 
+// forward-declared in test_builder.h
+void CheckTestGeneratedIsValid(const MyGame::Example::Color&);
+
 // Link-time check using pointer type.
 void CheckTestGeneratedIsValid(const MyGame::Example::Color &) {}