diff --git a/poac.toml b/poac.toml
index 7c4deceeb..8bff7c0b3 100644
--- a/poac.toml
+++ b/poac.toml
@@ -27,6 +27,7 @@ lto = true
 [lint.cpplint]
 filters = [
   "-build/c++11",
+  "-build/c++17",
   "-build/include_order", # prioritize clang-format
   "-build/include_subdir",
   "-legal/copyright",
diff --git a/src/Command.cc b/src/Command.cc
index b2a036e41..1f828c881 100644
--- a/src/Command.cc
+++ b/src/Command.cc
@@ -9,6 +9,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <fcntl.h>
+#include <string>
 #include <sys/wait.h>
 #include <unistd.h>
 #include <vector>