diff --git a/src/ipa/raspberrypi/controller/rpi/awb.cpp b/src/ipa/raspberrypi/controller/rpi/awb.cpp
index a16e04a07..2b88c3b01 100644
--- a/src/ipa/raspberrypi/controller/rpi/awb.cpp
+++ b/src/ipa/raspberrypi/controller/rpi/awb.cpp
@@ -6,6 +6,7 @@
  */
 
 #include <assert.h>
+#include <functional>
 
 #include <libcamera/base/log.h>