diff --git a/biome.jsonc b/biome.jsonc
index de53455ba505..63a65b9fdd6d 100644
--- a/biome.jsonc
+++ b/biome.jsonc
@@ -188,6 +188,26 @@
           }
         }
       }
+    },
+    {
+      "includes": ["**/astro/test/**"],
+      "linter": {
+        "rules": {
+          "style": {
+            "noRestrictedImports": {
+              "level": "error",
+              "options": {
+                "patterns": [
+                  {
+                    "group": ["**/src/**"],
+                    "message": "The test should not import the source code. Import the code from the dist/ folder instead."
+                  }
+                ]
+              }
+            }
+          }
+        }
+      }
     }
   ]
 }
diff --git a/packages/astro/test/types/schemas.ts b/packages/astro/test/types/schemas.ts
index 5059f763b167..3f84ba2a947a 100644
--- a/packages/astro/test/types/schemas.ts
+++ b/packages/astro/test/types/schemas.ts
@@ -1,9 +1,9 @@
 import { describe, it } from 'node:test';
 import { expectTypeOf } from 'expect-type';
 import type * as z from 'zod/v4';
-import { type FontProviderSchema, FontFamilySchema } from '../../src/assets/fonts/config.js';
-import type { FontProvider, FontFamily } from '../../src/assets/fonts/types.js';
-import type { CacheSchema, RouteRulesSchema } from '../../src/core/cache/config.js';
+import { type FontProviderSchema, FontFamilySchema } from '../../dist/assets/fonts/config.js';
+import type { FontProvider, FontFamily } from '../../dist/assets/fonts/types.js';
+import type { CacheSchema, RouteRulesSchema } from '../../dist/core/cache/config.js';
 import type { CacheProviderConfig, RouteRules } from '../../dist/core/cache/types.js';
 import type { SessionDriverConfigSchema } from '../../dist/core/session/config.js';
 import type { SessionDriverConfig } from '../../dist/core/session/types.js';