diff --git a/prometheus.egg b/prometheus.egg
index 9ff0c05..4a0d5ac 100644
--- a/prometheus.egg
+++ b/prometheus.egg
@@ -8,7 +8,9 @@
 (test-dependencies test)
 (components
  (extension hermes
-            (csc-options "-sJ"))
+            (csc-options "-sJ")
+            (source-dependencies hermes-impl.scm hermes.scm))
  (extension prometheus
            (csc-options "-sJ")
+           (source-dependencies prometheus-impl.scm prometheus.scm)
            (component-dependencies hermes))))