diff --git a/depends/gen_id b/depends/gen_id
index 5504deeb0eb..b9104c43359 100755
--- a/depends/gen_id
+++ b/depends/gen_id
@@ -28,6 +28,10 @@
     # Redirect stderr to stdout
     exec 2>&1
 
+    # Unset SOURCE_DATE_EPOCH to prevent it from leaking into tool
+    # outputs and to maximize reuse of the built package cache.
+    unset SOURCE_DATE_EPOCH
+
     echo "BEGIN ALL"
 
     # Include any ID salts supplied via command line