diff --git a/src/display/canvas.h b/src/display/canvas.h
index 6ca982a2..dc5638cd 100644
--- a/src/display/canvas.h
+++ b/src/display/canvas.h
@@ -1,6 +1,7 @@
 #ifndef RTORRENT_DISPLAY_CANVAS_H
 #define RTORRENT_DISPLAY_CANVAS_H
 
+#include <cstdarg>
 #include <string>
 #include <unordered_map>
 #include <vector>