diff --git a/src/check-tsconfig.ts b/src/check-tsconfig.ts
index c7e1810f..033742fe 100644
--- a/src/check-tsconfig.ts
+++ b/src/check-tsconfig.ts
@@ -7,5 +7,5 @@ export function checkTsConfig(parsedConfig: tsTypes.ParsedCommandLine): void
 	const module = parsedConfig.options.module!;
 
 	if (module !== tsModule.ModuleKind.ES2015 && module !== tsModule.ModuleKind.ES2020 && module !== tsModule.ModuleKind.ESNext)
-		throw new Error(`Incompatible tsconfig option. Module resolves to '${tsModule.ModuleKind[module]}'. This is incompatible with Rollup, please use 'module: "ES2015"', 'module: "ES2020"', or 'module: "ESNext"'.`);
+		throw new Error(`rpt2: Incompatible tsconfig option. Module resolves to '${tsModule.ModuleKind[module]}'. This is incompatible with Rollup, please use 'module: "ES2015"', 'module: "ES2020"', or 'module: "ESNext"'.`);
 }
diff --git a/src/tslib.ts b/src/tslib.ts
index d1789236..1c7f9362 100644
--- a/src/tslib.ts
+++ b/src/tslib.ts
@@ -15,6 +15,6 @@ try
 	tslibVersion = tslibPackage.version;
 } catch (e)
 {
-	console.warn("Error loading `tslib` helper library.");
+	console.warn("rpt2: Error loading `tslib` helper library.");
 	throw e;
 }