diff --git a/softsynth.c b/softsynth.c
index 9c5af80..3394434 100644
--- a/softsynth.c
+++ b/softsynth.c
@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <sys/select.h>
 #include <string.h>
 #include <ctype.h>