diff --git a/src/share/replaygain_synthesis/replaygain_synthesis.c b/src/share/replaygain_synthesis/replaygain_synthesis.c
index 5069d26c..9881794a 100644
--- a/src/share/replaygain_synthesis/replaygain_synthesis.c
+++ b/src/share/replaygain_synthesis/replaygain_synthesis.c
@@ -41,6 +41,7 @@
 
 #include <string.h> /* for memset() */
 #include <math.h>
+#include "share/compat.h"
 #include "share/replaygain_synthesis.h"
 #include "FLAC/assert.h"