diff --git a/agent/builder.py b/agent/builder.py
index 06133c01..fd45f7a9 100644
--- a/agent/builder.py
+++ b/agent/builder.py
@@ -528,6 +528,8 @@ def __init__(
         self.image_repository = image_repository
         self.image_tag = image_tag
         self.registry = registry
+        if platform not in ("arm64", "x86_64"):
+            raise ValueError(f"Invalid platform '{platform}'")
         self.platform = platform
 
         self._job_context = JobContext()