diff --git a/src/DecoderThread.cxx b/src/DecoderThread.cxx
index 0ea859ea8..72fc3cfb4 100644
--- a/src/DecoderThread.cxx
+++ b/src/DecoderThread.cxx
@@ -38,6 +38,8 @@
 #include "tag/ApeReplayGain.hxx"
 #include "Log.hxx"
 
+#include <functional>
+
 static constexpr Domain decoder_thread_domain("decoder_thread");
 
 /**