diff --git a/src/decoder/DsdLib.hxx b/src/decoder/DsdLib.hxx
index a20df99a6..6b7498df1 100644
--- a/src/decoder/DsdLib.hxx
+++ b/src/decoder/DsdLib.hxx
@@ -22,7 +22,7 @@
 
 #include "Compiler.h"
 
-#include <stdlib.h>
+#include <stddef.h>
 #include <stdint.h>
 
 struct Decoder;