diff --git a/tests/regression/method.c b/tests/regression/method.c
index 51a0fb9d1..16701c0b4 100644
--- a/tests/regression/method.c
+++ b/tests/regression/method.c
@@ -175,8 +175,8 @@ static result_t compress_cctx_compress(
                 state->compressed.capacity,
                 input.data,
                 input.size,
-                state->dictionary.data,
-                state->dictionary.size,
+                config->use_dictionary ? state->dictionary.data : NULL,
+                config->use_dictionary ? state->dictionary.size : 0,
                 params);
         else if (config->use_dictionary)
             state->compressed.size = ZSTD_compress_usingDict(