diff --git a/pkgs/by-name/op/openmpi/package.nix b/pkgs/by-name/op/openmpi/package.nix
index 01f9c8fb4310..2984c4c035d9 100644
--- a/pkgs/by-name/op/openmpi/package.nix
+++ b/pkgs/by-name/op/openmpi/package.nix
@@ -70,7 +70,6 @@ stdenv.mkDerivation (finalAttrs: {
   env = {
     USER = "nixbld";
     HOSTNAME = "localhost";
-    SOURCE_DATE_EPOCH = "0";
   };
 
   outputs = [