diff --git a/src/anbox/bridge/platform_api_skeleton.h b/src/anbox/bridge/platform_api_skeleton.h
index 7a9891b..843416e 100644
--- a/src/anbox/bridge/platform_api_skeleton.h
+++ b/src/anbox/bridge/platform_api_skeleton.h
@@ -18,6 +18,7 @@
 #ifndef ANBOX_BRIDGE_PLATFORM_SERVER_H_
 #define ANBOX_BRIDGE_PLATFORM_SERVER_H_
 
+#include <functional>
 #include <memory>
 
 namespace google {
diff --git a/src/anbox/qemu/at_parser.h b/src/anbox/qemu/at_parser.h
index 3935376..def3881 100644
--- a/src/anbox/qemu/at_parser.h
+++ b/src/anbox/qemu/at_parser.h
@@ -18,6 +18,7 @@
 #ifndef ANBOX_QEMU_AT_PARSER_H_
 #define ANBOX_QEMU_AT_PARSER_H_
 
+#include <functional>
 #include <map>
 #include <memory>
 #include <string>