diff --git a/tests/tools/cmp_tbdata.c b/tests/tools/cmp_tbdata.c
index b81ae1ca..c0b12cd9 100644
--- a/tests/tools/cmp_tbdata.c
+++ b/tests/tools/cmp_tbdata.c
@@ -4,8 +4,8 @@
 #include <string.h>
 
 int line = 0;
-char buffer1[1024];
-char buffer2[1024];
+char buffer1[8192];
+char buffer2[8192];
 
 void check(bool ok)
 {