diff --git a/test/suites/api/test_dump.c b/test/suites/api/test_dump.c
index 334dbfa..07fac7f 100644
--- a/test/suites/api/test_dump.c
+++ b/test/suites/api/test_dump.c
@@ -9,7 +9,7 @@
 #include <string.h>
 #include "util.h"
 
-static int encode_null_callback(void *ptr, size_t size, void *data)
+static int encode_null_callback(char *buffer, size_t size, void *data)
 {
     return 0;
 }