diff --git a/flake.nix b/flake.nix
index baff4571f..0336f562e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -81,12 +81,12 @@
           '';
 
         hevmBase = ps :
-          (ps.haskellPackages.callCabal2nix "hevm" ./. {
+          (ps.haskell.lib.addExtraLibraries (ps.haskellPackages.callCabal2nix "hevm" ./. {
             # Haskell libs with the same names as C libs...
             # Depend on the C libs, not the Haskell libs.
             # These are system deps, not Cabal deps.
             secp256k1 = ps.secp256k1;
-          }).overrideAttrs(final: prev: {
+          }) [ ps.libiconv ]).overrideAttrs(final: prev: {
             HEVM_SOLIDITY_REPO = solidity;
             HEVM_ETHEREUM_TESTS_REPO = ethereum-tests;
             HEVM_FORGE_STD_REPO = forge-std;