diff --git a/plugins/eg-fifths.lv2/fifths.c b/plugins/eg-fifths.lv2/fifths.c
index 95fce11..cc61cc9 100644
--- a/plugins/eg-fifths.lv2/fifths.c
+++ b/plugins/eg-fifths.lv2/fifths.c
@@ -16,6 +16,7 @@
 */
 
 #include <math.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #ifndef __cplusplus