diff --git a/src/zenml/config/server_config.py b/src/zenml/config/server_config.py
index b5d33750148..efc602530c4 100644
--- a/src/zenml/config/server_config.py
+++ b/src/zenml/config/server_config.py
@@ -432,6 +432,26 @@ def _validate_config(cls, data: Dict[str, Any]) -> Dict[str, Any]:
 
         return data
 
+    @field_validator("reportable_resources", mode="before")
+    @classmethod
+    def _convert_reportable_resources(cls, value: Any) -> Any:
+        """Convert reportable resources value if necessary.
+
+        This was previously set via an environment variable as a JSON-formatted
+        string. In case this still exists somewhere, this method converts the
+        JSON string to a list.
+
+        Args:
+            value: The reportable resources values.
+
+        Returns:
+            The potentially converted value.
+        """
+        if isinstance(value, str):
+            value = json.loads(value)
+
+        return value
+
     @property
     def deployment_id(self) -> UUID:
         """Get the ZenML server deployment ID.