diff --git a/build.sbt b/build.sbt
index df5bb41..069f77b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -127,6 +127,8 @@
   (test in Test).value
 }
 
+envVars := Map("SOURCE_DATE_EPOCH" -> (System.currentTimeMillis() / 1000).toString)
+
 val executableKey = TaskKey[File]("executable")
 executableKey := {
   import java.util.jar.Attributes.{Name => AttrName}