diff --git a/emtest/select.c b/emtest/select.c
index 3a785cb5b..98c23264c 100644
--- a/emtest/select.c
+++ b/emtest/select.c
@@ -262,4 +262,5 @@ to3dig(i)
 	*s++ = (i % 100) / 10 + '0';
 	*s++ = (i % 10) + '0';
 	*s = '\0';
+	return buf;
 }