diff --git a/tests/core_tests/chaingen_main.cpp b/tests/core_tests/chaingen_main.cpp
index bd62a042..e2188c53 100644
--- a/tests/core_tests/chaingen_main.cpp
+++ b/tests/core_tests/chaingen_main.cpp
@@ -1104,7 +1104,7 @@ int main(int argc, char* argv[])
     GENERATE_AND_PLAY(pos_wallet_big_block_test);
     //GENERATE_AND_PLAY(block_template_against_txs_size); // Long test! by demand only
     GENERATE_AND_PLAY(pos_altblocks_validation);
-    GENERATE_AND_PLAY(pos_mining_with_decoys);
+    GENERATE_AND_PLAY_HF(pos_mining_with_decoys, "3");
 
     // alternative blocks and generic chain-switching tests
     GENERATE_AND_PLAY(gen_chain_switch_pow_pos);