diff --git a/main/chanvars.c b/main/chanvars.c
index e21b3fc57c..7e617c1fb9 100644
--- a/main/chanvars.c
+++ b/main/chanvars.c
@@ -27,6 +27,7 @@
 
 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>