diff --git a/cpp/bosdyn/client/data_buffer/signal_schema_key.h b/cpp/bosdyn/client/data_buffer/signal_schema_key.h
index b7829c4..ef80d79 100644
--- a/cpp/bosdyn/client/data_buffer/signal_schema_key.h
+++ b/cpp/bosdyn/client/data_buffer/signal_schema_key.h
@@ -11,6 +11,7 @@
 
 #include <stdint.h>
 #include <string>
+#include <cstdint>
 
 namespace bosdyn {