diff --git a/rebar.config b/rebar.config
index 111ce1c..e0b0d47 100644
--- a/rebar.config
+++ b/rebar.config
@@ -12,7 +12,7 @@
 
         %% Cuckoo CPU miners (not prebuilt).
         {aecuckoo, {git, "https://github.com/aeternity/aecuckoo.git",
-                    {ref, "fa3d13e"}}},
+                    {ref, "a1bff574dd0a965d3f9f2e23f980bbead8b4638d"}}},
 
         %% This is used just in one place, just to get blake2b_256 hash.
         {enacl, {git, "https://github.com/aeternity/enacl.git",