diff --git a/conformance/fork_pipe_runner.cc b/conformance/fork_pipe_runner.cc
index 5a70c9fc26846..2a48333e7cbf0 100644
--- a/conformance/fork_pipe_runner.cc
+++ b/conformance/fork_pipe_runner.cc
@@ -39,6 +39,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
+#include <chrono>
 #include <cstdint>
 #include <cstdio>
 #include <cstdlib>