diff --git a/pkgs/scnlib/default.nix b/pkgs/scnlib/default.nix
index 8e8852e..b9624d9 100644
--- a/pkgs/scnlib/default.nix
+++ b/pkgs/scnlib/default.nix
@@ -18,7 +18,9 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ fast-float ];
+  buildInputs = [
+    (fast-float.overrideAttrs(old: { version = "6.1.6"; }))
+  ];
 
   cmakeFlags = [
     "-DSCN_TESTS=OFF"