diff --git a/pkgs/by-name/xm/xmlsec/package.nix b/pkgs/by-name/xm/xmlsec/package.nix
index 0d0d713b443a..abf6cf39530e 100644
--- a/pkgs/by-name/xm/xmlsec/package.nix
+++ b/pkgs/by-name/xm/xmlsec/package.nix
@@ -79,7 +79,7 @@ lib.fix (
     configureFlags = [ "--enable-soap" ];
 
     # otherwise libxmlsec1-gnutls.so won't find libgcrypt.so, after #909
-    NIX_LDFLAGS = "-lgcrypt";
+    env.NIX_LDFLAGS = "-lgcrypt";
 
     postInstall = ''
       moveToOutput "bin/xmlsec1-config" "$dev"