diff --git a/pkgs/tools/networking/siege/default.nix b/pkgs/tools/networking/siege/default.nix
index 48e2fc5ef78..976d8b3bc06 100644
--- a/pkgs/tools/networking/siege/default.nix
+++ b/pkgs/tools/networking/siege/default.nix
@@ -10,7 +10,9 @@ stdenv.mkDerivation rec {
 
   NIX_LDFLAGS = stdenv.lib.optionalString stdenv.isLinux "-lgcc_s";
 
-  configureFlags = [ "--with-ssl=${openssl}" ];
+  buildInputs = [ openssl ];
+
+  configureFlags = [ "--with-ssl=${openssl.dev}" ];
 
   meta = with stdenv.lib; {
     description = "HTTP load tester";