diff --git a/spec/PKPass.ts b/spec/PKPass.ts
index 9704213..7955f80 100644
--- a/spec/PKPass.ts
+++ b/spec/PKPass.ts
@@ -960,12 +960,12 @@ describe("PKPass", () => {
 				PKPass.from(),
 			).toBeRejectedWithError(
 				TypeError,
-				"Cannot create PKPass from source: source is 'undefined'",
+				Messages.FROM.MISSING_SOURCE.replace("%s", "undefined"),
 			);
 
 			await expectAsync(PKPass.from(null)).toBeRejectedWithError(
 				TypeError,
-				"Cannot create PKPass from source: source is 'null'",
+				Messages.FROM.MISSING_SOURCE.replace("%s", "null"),
 			);
 		});
 
diff --git a/src/PKPass.ts b/src/PKPass.ts
index e8e5fdc..219f5b0 100644
--- a/src/PKPass.ts
+++ b/src/PKPass.ts
@@ -46,7 +46,7 @@ export default class PKPass extends Bundle {
 
 		if (!source) {
 			throw new TypeError(
-				`Cannot create PKPass from source: source is '${source}'`,
+				formatMessage(Messages.FROM.MISSING_SOURCE, source),
 			);
 		}
 
diff --git a/src/messages.ts b/src/messages.ts
index fdf0f47..5a3749c 100644
--- a/src/messages.ts
+++ b/src/messages.ts
@@ -78,6 +78,10 @@ export const BUNDLE = {
 	CLOSED: "Cannot add file. Bundle is closed.",
 } as const;
 
+export const FROM = {
+	MISSING_SOURCE: "Cannot create PKPass from source: source is '%s'",
+} as const;
+
 export const PACK = {
 	INVALID: "Cannot pack passes. Only PKPass instances allowed",
 } as const;