diff --git a/test_conformance/relationals/test_comparisons_fp.cpp b/test_conformance/relationals/test_comparisons_fp.cpp
index 580b7422..c3d8f67a 100644
--- a/test_conformance/relationals/test_comparisons_fp.cpp
+++ b/test_conformance/relationals/test_comparisons_fp.cpp
@@ -14,6 +14,8 @@
 // limitations under the License.
 //
 
+#include <cstdint>
+#include <functional>
 #include <iostream>
 #include <map>
 #include <memory>