diff --git a/pkgs/tools/networking/openconnect/common.nix b/pkgs/tools/networking/openconnect/common.nix
index be972bf2636b..b9ff4d68382e 100644
--- a/pkgs/tools/networking/openconnect/common.nix
+++ b/pkgs/tools/networking/openconnect/common.nix
@@ -38,6 +38,11 @@ stdenv.mkDerivation {
     "--without-openssl-version-check"
   ];
 
+  # Not finding iconv on Darwin
+  env = {
+    am_cv_func_iconv_works = "yes";
+  };
+
   buildInputs = [
     gmp
     libxml2