diff --git a/src/nix/run.cc b/src/nix/run.cc
index 63ae8a195..956563591 100644
--- a/src/nix/run.cc
+++ b/src/nix/run.cc
@@ -75,7 +75,7 @@ void execProgramInStore(ref<Store> store,
 
 }
 
-struct CmdRun : InstallableValueCommand
+struct CmdRun : InstallableValueCommand, MixEnvironment
 {
     using InstallableCommand::run;
 
@@ -135,6 +135,8 @@ struct CmdRun : InstallableValueCommand
         // we are about to exec out of this process without running C++ destructors.
         state->evalCaches.clear();
 
+        setEnviron();
+
         execProgramInStore(store, UseLookupPath::DontUse, app.program, allArgs);
     }
 };