diff --git a/config.nims b/config.nims
index 36999e496..5663fd242 100644
--- a/config.nims
+++ b/config.nims
@@ -107,6 +107,7 @@ if not defined(windows):
 --define:nimTypeNames
 --styleCheck:usages
 --styleCheck:hint
+--mm:refc
 
 switch("define", "withoutPCRE")
 
diff --git a/nimbus/db/era1_db/db_desc.nim b/nimbus/db/era1_db/db_desc.nim
index 835247083..0c29811ad 100644
--- a/nimbus/db/era1_db/db_desc.nim
+++ b/nimbus/db/era1_db/db_desc.nim
@@ -15,7 +15,7 @@ import
   std/[os, parseutils, strutils, tables],
   results,
   eth/common/eth_types,
-  ../../fluffy/eth_data/era1
+  ../../../fluffy/eth_data/era1
 
 export results, eth_types
 
diff --git a/tests/test_pow.nim b/tests/test_pow.nim
index cd68c6861..e9538c026 100644
--- a/tests/test_pow.nim
+++ b/tests/test_pow.nim
@@ -13,7 +13,6 @@ import
   ./replay/[pp, gunzip],
   ../nimbus/core/[pow, pow/pow_cache],
   eth/common,
-  stew/endians2,
   unittest2
 
 const