diff --git a/package.json b/package.json
index 2d7ac79a..0e209242 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
   "devDependencies": {
     "@babel/core": "^7.5.4",
     "@polkadot/dev": "^0.30.0-beta.23",
-    "@polkadot/util": "^0.94.0-beta.17",
+    "@polkadot/util": "^0.94.0-beta.18",
     "override-require": "^1.1.1"
   }
 }
diff --git a/scripts/build-package.sh b/scripts/build-package.sh
index 2f620c58..a762b9f6 100755
--- a/scripts/build-package.sh
+++ b/scripts/build-package.sh
@@ -2,6 +2,13 @@
 
 set -e
 
+BGJ=build/wasm_bg.js
+SRC_WASM=build/wasm.js
+DEF=build/wasm.d.ts
+WSM=build/wasm_bg.wasm
+OPT=build/wasm_opt.wasm
+ASM=build/wasm_asm.js
+
 echo "*** Building package"
 
 # cleanup old
@@ -13,34 +20,24 @@ echo "*** Building WASM output"
 rustup run nightly wasm-pack build --release --scope polkadot --target nodejs
 mv pkg build
 
-# shortcuts for files
-echo "*** Adjusting output"
-BGJ=build/wasm_bg.js
-SRC_WASM=build/wasm.js
-DEF=build/wasm.d.ts
-WSM=build/wasm_bg.wasm
-OPT=build/wasm_opt.wasm
-ASM=build/wasm_asm.js
-TMP=build/wasm_tmp.js
-
 # optimise
 echo "*** Optimising WASM output"
 ../../binaryen/bin/wasm-opt $WSM -Os -o $OPT
-# cp -f build/wasm_bg.wasm build/wasm_opt.wasm
-
-# build asmjs version from the input (optimised) WASM
-# echo "*** Building asm.js version"
-echo "*** Building asm.js version"
-../../binaryen/bin/wasm2js --no-validation --output $TMP $OPT
-
-# get babel to take care of making it sane
-NODE_OPTIONS=--max_old_space_size=8192 yarn babel $TMP --presets @babel/preset-env --out-file=$ASM
-rm -rf $TMP
 
 # convert wasm to base64 structure
 echo "*** Packing WASM into base64"
 node ../../scripts/pack-wasm-base64.js
 
+# build asmjs version from the input (optimised) WASM
+echo "*** Building asm.js version"
+../../binaryen/bin/wasm2js --output $ASM $OPT
+
+# cleanup the generated output, sadly there are no node-js outputs above
+sed -i -e 's/import {/\/\/ import {/g' $ASM
+sed -i -e 's/function asmFunc/var schnorrkel = require('\''\.\/wasm'\''); function asmFunc/g' $ASM
+sed -i -e 's/{abort.*},memasmFunc/schnorrkel, memasmFunc/g' $ASM
+sed -i -e 's/export var /module\.exports\./g' $ASM
+
 # copy our package interfaces
 echo "*** Copying package sources"
 cp src/js/* build/
diff --git a/yarn.lock b/yarn.lock
index 53e52828..a8d816c3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2030,10 +2030,10 @@
     typescript "^3.5.3"
     vuepress "^1.0.2"
 
-"@polkadot/util@^0.94.0-beta.17":
-  version "0.94.0-beta.17"
-  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.94.0-beta.17.tgz#998a0cb69d7005d4fcb0c94a9d2db1fa48ae584b"
-  integrity sha512-NYZF1gN4Yr31uMJe9x6MSTuvBOPn3NOH2RTs5Juz4wCG6Q2ejjPk0l3HG4/6rDq5Uh+x/zw3DREpayBpN36ihw==
+"@polkadot/util@^0.94.0-beta.18":
+  version "0.94.0-beta.18"
+  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.94.0-beta.18.tgz#363581e1092a1972d1f14df0db18d85a3a27f380"
+  integrity sha512-SzcKGFeskHQMdrZDnsRQ72lFYkUBWAJBAhjMrpUZR0iMvOSnjaX663034PLr3hvUKunh9W6NjQHJAOrpBgaFfA==
   dependencies:
     "@babel/runtime" "^7.5.5"
     "@types/bn.js" "^4.11.5"