diff --git a/mozilla/raptor.mak b/mozilla/raptor.mak
index 6e93b4b86ea..15a91e49042 100644
--- a/mozilla/raptor.mak
+++ b/mozilla/raptor.mak
@@ -322,7 +322,7 @@ doc_raptor:
 
 # Build tarball
 
-DATE_CMD=unix_date
+DATE_CMD=$(MOZ_TOOLS)\bin\unix_date
 !if [$(DATE_CMD) +%Y%m%d > today.inc]
 !endif
 DATE=\