diff --git a/Makefile b/Makefile
index db51d65..a03ad49 100644
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,13 @@ endif
 clean:
 	@$(CLEAN_CMD)
 
+# cross platform pwsh
+clean-cp:
+	@pwsh -Command 'if(Test-Path $(OUTPUT_DIR)){Remove-Item -Force -Recurse $(OUTPUT_DIR)}'
+	@pwsh -Command 'if(Test-Path $(NODE_MODULES)){Remove-Item -Force -Recurse $(NODE_MODULES)}'
+	@pwsh -Command 'if(Test-Path $(DOCKER_DIST)){Remove-Item -Force -Recurse $(DOCKER_DIST)}'
+	@pwsh -Command 'if(Test-Path $(ROLLUP_CACHE)){Remove-Item -Force -Recurse $(ROLLUP_CACHE)}'
+
 ################
 # Host Targets #
 ################
diff --git a/src/main.ts b/src/main.ts
index 0c0b47b..20ae4fa 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -5,4 +5,4 @@ export type { Secp256k1 } from './api/secp256k1';
 import { Secp256k1, WasmSecp256k1 } from './api/secp256k1';
 import SB64_SECP256K1_WASM from './gen/secp256k1.wasm';
 
-export const initWasmSecp256k1 = (): Promise<Secp256k1> => WasmSecp256k1(Buffer.from(SB64_SECP256K1_WASM, 'base64url'));
+export const initWasmSecp256k1 = (): Promise<Secp256k1> => WasmSecp256k1(Buffer.from(SB64_SECP256K1_WASM, 'base64'));