diff --git a/packages/proto-signing/package.json b/packages/proto-signing/package.json
index 6d3d2295..142f148c 100644
--- a/packages/proto-signing/package.json
+++ b/packages/proto-signing/package.json
@@ -37,8 +37,9 @@
     "test": "yarn build-or-skip && yarn test-node",
     "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
     "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js",
+    "preget-proto": "rm -rf proto",
     "get-proto": "REF=master ./scripts/get-proto.sh",
-    "predefine-proto": "mkdir -p src/generated && pbjs -t static-module -w commonjs -o src/generated/codecimpl.tmp.js --sparse --no-beautify --no-delimited --no-verify --no-convert ./proto/cosmos/cosmos-sdk/{x/bank/types/types.proto,types/types.proto,types/tx/types.proto,types/tx/signing/types.proto,third_party/proto/tendermint/**/*.proto,crypto/types/types.proto}",
+    "predefine-proto": "./scripts/predefine-proto.sh",
     "define-proto": "pbts src/generated/codecimpl.tmp.js -o src/generated/codecimpl.d.ts && tsc --removeComments --outFile src/generated/codecimpl.js --allowJs src/generated/codecimpl.tmp.js && rm src/generated/codecimpl.tmp.js",
     "postdefine-proto": "prettier --write \"src/generated/codecimpl.*\""
   },
diff --git a/packages/proto-signing/scripts/predefine-proto.sh b/packages/proto-signing/scripts/predefine-proto.sh
new file mode 100755
index 00000000..7d4814cd
--- /dev/null
+++ b/packages/proto-signing/scripts/predefine-proto.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+set -o errexit -o nounset -o pipefail
+command -v shellcheck > /dev/null && shellcheck "$0"
+
+GENERATED_DIR="./tmp"
+ROOT_PROTO_DIR="./proto/cosmos/cosmos-sdk"
+COSMOS_PROTO_DIR="$ROOT_PROTO_DIR/proto/cosmos"
+TENDERMINT_PROTO_DIR="$ROOT_PROTO_DIR/third_party/proto/tendermint"
+GOOGLE_PROTO_DIR="$ROOT_PROTO_DIR/third_party/proto/google"
+
+mkdir -p "$GENERATED_DIR"
+pbjs \
+  -t static-module \
+  --es6 \
+  -w commonjs \
+  -o "$GENERATED_DIR/codecimpl.js" \
+  --sparse \
+  --no-beautify \
+  --no-delimited \
+  --no-verify \
+  --no-convert \
+  "$COSMOS_PROTO_DIR/cosmos.proto" \
+  "$COSMOS_PROTO_DIR/bank/bank.proto" \
+  "$COSMOS_PROTO_DIR/crypto/crypto.proto" \
+  "$COSMOS_PROTO_DIR/tx/tx.proto" \
+  "$COSMOS_PROTO_DIR/tx/signing/signing.proto" \
+  "$TENDERMINT_PROTO_DIR/abci/types/types.proto" \
+  "$TENDERMINT_PROTO_DIR/crypto/merkle/merkle.proto" \
+  "$TENDERMINT_PROTO_DIR/libs/kv/types.proto" \
+  "$GOOGLE_PROTO_DIR/protobuf/any.proto"