diff --git a/scripts/prepare_moneroc.sh b/scripts/prepare_moneroc.sh
index 2d7b06f0c..16c68dd8f 100755
--- a/scripts/prepare_moneroc.sh
+++ b/scripts/prepare_moneroc.sh
@@ -18,9 +18,17 @@ fi
 git fetch -a
 git checkout bc8d1a0b75b97156d71579581b4cdfe58c777ed2
 git reset --hard
-git submodule update --init --force --recursive
 
-for coin in monero wownero zano;
+# Hash Wallet: monero_c bundles monero, wownero, AND zano as sibling
+# submodules. Upstream did `git submodule update --init --recursive` which
+# pulled ALL three (and their deep transitive submodules — zano alone drags
+# down a ~100MB Qt UI tree we don't need). Init only the coins we ship,
+# shallow clones, in parallel.
+git submodule deinit -f zano 2>/dev/null || true
+rm -rf zano
+git submodule update --init --recursive --depth 1 --jobs 8 monero wownero
+
+for coin in monero wownero;
 do
     if [[ ! -f "$coin/.patch-applied" ]];
     then