diff --git a/tests/checkasm/vf_blend.c b/tests/checkasm/vf_blend.c
index a7578fec39..bdd21d4986 100644
--- a/tests/checkasm/vf_blend.c
+++ b/tests/checkasm/vf_blend.c
@@ -99,7 +99,7 @@ void checkasm_check_blend(void)
 
 #define check_and_report(name, val, depth)        \
     param.mode = val;                             \
-    ff_blend_init(&param, depth - 1);             \
+    ff_blend_init(&param, depth * 8);             \
     if (check_func(param.blend, #name))           \
         check_blend_func(depth);