diff --git a/.changeset/eleven-donkeys-agree.md b/.changeset/eleven-donkeys-agree.md
new file mode 100644
index 0000000000..978094095d
--- /dev/null
+++ b/.changeset/eleven-donkeys-agree.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Correctly add `<source>/project-slug` annotation for new catalog-info.yaml PRs based on SCM integration.
diff --git a/plugins/catalog-backend/src/ingestion/LocationAnalyzer.ts b/plugins/catalog-backend/src/ingestion/LocationAnalyzer.ts
index bc81cf14f8..cacdf38ffd 100644
--- a/plugins/catalog-backend/src/ingestion/LocationAnalyzer.ts
+++ b/plugins/catalog-backend/src/ingestion/LocationAnalyzer.ts
@@ -16,6 +16,8 @@
 
 import { Logger } from 'winston';
 import parseGitUrl from 'git-url-parse';
+import { Entity } from '@backstage/catalog-model';
+import { ScmIntegrationRegistry } from '@backstage/integration';
 import {
   AnalyzeLocationRequest,
   AnalyzeLocationResponse,
@@ -24,25 +26,50 @@ import {
 
 export class RepoLocationAnalyzer implements LocationAnalyzer {
   private readonly logger: Logger;
+  private readonly scmIntegrations: ScmIntegrationRegistry;
 
-  constructor(logger: Logger) {
+  constructor(logger: Logger, scmIntegrations: ScmIntegrationRegistry) {
     this.logger = logger;
+    this.scmIntegrations = scmIntegrations;
   }
   async analyzeLocation(
     request: AnalyzeLocationRequest,
   ): Promise<AnalyzeLocationResponse> {
-    const { owner, name, source } = parseGitUrl(request.location.target);
-    const entity = {
+    const { owner, name } = parseGitUrl(request.location.target);
+    const entity: Entity = {
       apiVersion: 'backstage.io/v1alpha1',
       kind: 'Component',
       metadata: {
         name: name,
-        // Probably won't handle properly self-hosted git providers with custom url
-        annotations: { [`${source}/project-slug`]: `${owner}/${name}` },
       },
       spec: { type: 'other', lifecycle: 'unknown' },
     };
 
+    const integration = this.scmIntegrations.byUrl(request.location.target);
+    let annotationPrefix;
+    switch (integration?.type) {
+      case 'azure':
+        annotationPrefix = 'dev.azure.com';
+        break;
+      case 'bitbucket':
+        annotationPrefix = 'bitbucket.org';
+        break;
+      case 'github':
+        annotationPrefix = 'github.com';
+        break;
+      case 'gitlab':
+        annotationPrefix = 'gitlab.com';
+        break;
+      default:
+        break;
+    }
+
+    if (annotationPrefix) {
+      entity.metadata.annotations = {
+        [`${annotationPrefix}/project-slug`]: `${owner}/${name}`,
+      };
+    }
+
     this.logger.debug(`entity created for ${request.location.target}`);
     return {
       existingEntityFiles: [],
diff --git a/plugins/catalog-backend/src/next/NextCatalogBuilder.ts b/plugins/catalog-backend/src/next/NextCatalogBuilder.ts
index 43f321248e..e10d13c129 100644
--- a/plugins/catalog-backend/src/next/NextCatalogBuilder.ts
+++ b/plugins/catalog-backend/src/next/NextCatalogBuilder.ts
@@ -275,7 +275,7 @@ export class NextCatalogBuilder {
     );
 
     const locationsCatalog = new DatabaseLocationsCatalog(db);
-    const locationAnalyzer = new RepoLocationAnalyzer(logger);
+    const locationAnalyzer = new RepoLocationAnalyzer(logger, integrations);
     const locationService = new DefaultLocationService(
       locationStore,
       orchestrator,
diff --git a/plugins/catalog-backend/src/service/CatalogBuilder.ts b/plugins/catalog-backend/src/service/CatalogBuilder.ts
index b8d8b3ee61..f742e3c0db 100644
--- a/plugins/catalog-backend/src/service/CatalogBuilder.ts
+++ b/plugins/catalog-backend/src/service/CatalogBuilder.ts
@@ -228,6 +228,7 @@ export class CatalogBuilder {
     locationAnalyzer: LocationAnalyzer;
   }> {
     const { config, database, logger } = this.env;
+    const integrations = ScmIntegrations.fromConfig(config);
 
     const policy = this.buildEntityPolicy();
     const processors = this.buildProcessors();
@@ -255,7 +256,7 @@ export class CatalogBuilder {
       locationReader,
       logger,
     );
-    const locationAnalyzer = new RepoLocationAnalyzer(logger);
+    const locationAnalyzer = new RepoLocationAnalyzer(logger, integrations);
 
     return {
       entitiesCatalog,