diff --git a/.changeset/fuzzy-bears-nail.md b/.changeset/fuzzy-bears-nail.md
new file mode 100644
index 00000000..63ed407a
--- /dev/null
+++ b/.changeset/fuzzy-bears-nail.md
@@ -0,0 +1,6 @@
+---
+'@powersync/common': patch
+'@powersync/web': patch
+---
+
+Handle additional forward slash in the POWERSYNC_URL environment variable
diff --git a/packages/common/src/client/sync/stream/AbstractRemote.ts b/packages/common/src/client/sync/stream/AbstractRemote.ts
index 73cd0a28..abfba091 100644
--- a/packages/common/src/client/sync/stream/AbstractRemote.ts
+++ b/packages/common/src/client/sync/stream/AbstractRemote.ts
@@ -14,6 +14,7 @@ import { version as POWERSYNC_JS_VERSION } from '../../../../package.json';
 
 export type BSONImplementation = typeof BSON;
 
+const POWERSYNC_TRAILING_SLASH_MATCH = /\/+$/;
 export type RemoteConnector = {
   fetchCredentials: () => Promise<PowerSyncCredentials | null>;
 };
@@ -108,6 +109,11 @@ export abstract class AbstractRemote {
       return this.credentials!;
     }
     this.credentials = await this.connector.fetchCredentials();
+    if (this.credentials?.endpoint.match(POWERSYNC_TRAILING_SLASH_MATCH)) {
+      throw new Error(
+        `A trailing forward slash "/" was found in the fetchCredentials endpoint: "${this.credentials.endpoint}". Remove the trailing forward slash "/" to fix this error.`
+      );
+    }
     return this.credentials;
   }