diff --git a/tests/core_tests/chaingen.h b/tests/core_tests/chaingen.h
index fdcb6239..822ccfb1 100644
--- a/tests/core_tests/chaingen.h
+++ b/tests/core_tests/chaingen.h
@@ -674,4 +674,4 @@ inline bool do_replay_file(const std::string& filename)
 #define CHECK_EQ(v1, v2) CHECK_AND_ASSERT_MES(v1 == v2, false, "[" << perr_context << "] failed: \"" << QUOTEME(v1) << " == " << QUOTEME(v2) << "\", " << v1 << " != " << v2)
 #define CHECK_NOT_EQ(v1, v2) CHECK_AND_ASSERT_MES(!(v1 == v2), false, "[" << perr_context << "] failed: \"" << QUOTEME(v1) << " != " << QUOTEME(v2) << "\", " << v1 << " == " << v2)
 #define MK_COINS(amount) (UINT64_C(amount) * COIN)
-#define TESTS_DEFAULT_FEE ((uint64_t)1000000) // pow(10, 6)
+#define TESTS_DEFAULT_FEE ((uint64_t)20000000000) // 2 * pow(10, 10)