diff --git a/scripts/nix-push.in b/scripts/nix-push.in
index 57d89d13cc..02f40f04a9 100644
--- a/scripts/nix-push.in
+++ b/scripts/nix-push.in
@@ -12,7 +12,7 @@ my $manifest = "$tmpdir/MANIFEST";
 
 END { unlink $manifest; unlink $nixfile; rmdir $tmpdir; }
 
-my $curl = "@curl@ --fail --silent";
+my $curl = "@curl@ --fail --silent ${ENV{'CURL_FLAGS'}}";
 
 
 # Parse the command line.