diff --git a/pkgs/servers/openxpki/default.nix b/pkgs/servers/openxpki/default.nix
index dd1ed7c473b7..12ed3f56d9f4 100644
--- a/pkgs/servers/openxpki/default.nix
+++ b/pkgs/servers/openxpki/default.nix
@@ -50,7 +50,10 @@ buildPerlPackage {
       lib libapreq2 libnet podlators threads threadsshared version ];
 
   preConfigure = ''
-    export OPENSSL_PREFIX=${openssl}
+    substituteInPlace core/server/Makefile.PL \
+      --replace "my \$openssl_inc_dir = ''';" "my \$openssl_inc_dir = '${openssl}/include';" \
+      --replace "my \$openssl_lib_dir = ''';" "my \$openssl_lib_dir = '${openssl.out}/lib';" \
+      --replace "my \$openssl_binary  = ''';" "my \$openssl_binary  = '${openssl.bin}/bin/openssl';"
     substituteInPlace tools/vergen --replace "#!/usr/bin/perl" "#!${perl}/bin/perl"
     cp ${./vergen_revision_state} .vergen_revision_state
     cd core/server