diff --git a/libs/pbd/pbd/playback_buffer.h b/libs/pbd/pbd/playback_buffer.h
index e5a6857b1f..d41adea2e2 100644
--- a/libs/pbd/pbd/playback_buffer.h
+++ b/libs/pbd/pbd/playback_buffer.h
@@ -21,6 +21,7 @@
 #define playback_buffer_h
 
 #include <cstring>
+#include <stdint.h>
 #include <glibmm.h>
 
 #include "pbd/libpbd_visibility.h"