diff --git a/src/client_backend/openai/http_client.h b/src/client_backend/openai/http_client.h
index 82e991da..5b572bf4 100644
--- a/src/client_backend/openai/http_client.h
+++ b/src/client_backend/openai/http_client.h
@@ -33,6 +33,7 @@
 #include <map>
 #include <memory>
 #include <mutex>
+#include <string>
 #include <thread>
 
 namespace triton { namespace perfanalyzer { namespace clientbackend {