diff --git a/dist/index.js b/dist/index.js
index 80ae0659..88a75133 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -99435,10 +99435,9 @@ function checkOutBook(bookParams, library) {
 
 
 
-async function getIsbn(options) {
+async function getIsbn(options, isLibrofm = false) {
     const { inputIdentifier, providers } = options;
     let book;
-    const isLibrofm = inputIdentifier.startsWith("https://libro.fm");
     const identifier = isLibrofm
         ? getLibrofmId(inputIdentifier)
         : inputIdentifier;
@@ -116922,7 +116921,7 @@ async function getLibrofm(options) {
             ...options,
             providers: ["librofm"],
         };
-        const book = await getIsbn(newOptions);
+        const book = await getIsbn(newOptions, true);
         return book;
     }
     catch (error) {
diff --git a/src/providers/isbn.ts b/src/providers/isbn.ts
index 92a3ca19..3323cfc3 100644
--- a/src/providers/isbn.ts
+++ b/src/providers/isbn.ts
@@ -4,10 +4,12 @@ import { NewBook } from "../new-book";
 import { formatDescription, getLibrofmId } from "../utils";
 import { exportVariable, getInput, warning } from "@actions/core";
 
-export async function getIsbn(options: BookParams): Promise<NewBook> {
+export async function getIsbn(
+  options: BookParams,
+  isLibrofm = false
+): Promise<NewBook> {
   const { inputIdentifier, providers } = options;
   let book;
-  const isLibrofm = inputIdentifier.startsWith("https://libro.fm");
   const identifier = isLibrofm
     ? getLibrofmId(inputIdentifier)
     : inputIdentifier;
diff --git a/src/providers/librofm.ts b/src/providers/librofm.ts
index 414adfc2..465f0053 100644
--- a/src/providers/librofm.ts
+++ b/src/providers/librofm.ts
@@ -10,7 +10,7 @@ export async function getLibrofm(
       ...options,
       providers: ["librofm"],
     };
-    const book = await getIsbn(newOptions);
+    const book = await getIsbn(newOptions, true);
     return book;
   } catch (error) {
     throw new Error(`Failed to get book from Libro.fm: ${error.message}`);