diff --git a/packages/lib/src/data/ModPack.ts b/packages/lib/src/data/ModPack.ts
index 26fe2565..ff30bab3 100644
--- a/packages/lib/src/data/ModPack.ts
+++ b/packages/lib/src/data/ModPack.ts
@@ -218,7 +218,7 @@ export default class ModPack {
 		let buf = Buffer.from(modPackString, "base64");
 		try {
 			// eslint-disable-next-line node/no-sync
-			buf = zlib.inflateSync(buf);
+			buf = Buffer.from(zlib.inflateSync(buf));
 		} catch (err: any) {
 			if (err.code.startsWith("Z_")) {
 				throw new Error("Malformed mod pack string: zlib inflate failed");
diff --git a/packages/lib/src/factorio/exchange_string.ts b/packages/lib/src/factorio/exchange_string.ts
index e5c2e7b1..6f7e3380 100644
--- a/packages/lib/src/factorio/exchange_string.ts
+++ b/packages/lib/src/factorio/exchange_string.ts
@@ -414,7 +414,7 @@ export function readMapExchangeString(exchangeString: string) {
 	let buf = Buffer.from(exchangeString.slice(3, -3), "base64");
 	try {
 		// eslint-disable-next-line node/no-sync
-		buf = zlib.inflateSync(buf);
+		buf = Buffer.from(zlib.inflateSync(buf));
 	} catch (err: any) {
 		if (err.code.startsWith("Z_")) {
 			throw new Error("Malformed map exchange string: zlib inflate failed");