diff --git a/fluffy/nim.cfg b/fluffy/nim.cfg
index 2972285a4..cf160b8ab 100644
--- a/fluffy/nim.cfg
+++ b/fluffy/nim.cfg
@@ -12,8 +12,6 @@
   -d:"chronicles_line_numbers:0"
 @end
 
--d:PREFER_BLST_SHA256=false
-
 --styleCheck:usages
 --styleCheck:error
 --hint[Processing]:off
diff --git a/nimbus_verified_proxy/nim.cfg b/nimbus_verified_proxy/nim.cfg
index 726df9e24..c14650a00 100644
--- a/nimbus_verified_proxy/nim.cfg
+++ b/nimbus_verified_proxy/nim.cfg
@@ -12,8 +12,6 @@
   -d:"chronicles_line_numbers:0"
 @end
 
--d:PREFER_BLST_SHA256=false
-
 # Use only `secp256k1` public key cryptography as an identity in LibP2P.
 -d:"libp2p_pki_schemes=secp256k1"