1 files changed, 8 insertions, 6 deletions

diff --git a/src/nix/build.cc b/src/nix/build.cc
index da7c7f614..a6fcf5094 100644
--- a/src/nix/build.cc
+++ b/src/nix/build.cc
@@ -11,7 +11,7 @@ struct CmdBuild : MixDryRun, InstallablesCommand
 {
     Path outLink = "result";
 
-    std::optional<std::string> gitRepo = std::nullopt;
+    bool updateLock = true;
 
     CmdBuild()
     {
@@ -28,9 +28,9 @@ struct CmdBuild : MixDryRun, InstallablesCommand
             .set(&outLink, Path(""));
 
         mkFlag()
-            .longName("update-lock-file")
-            .description("update the lock file")
-            .dest(&gitRepo);
+            .longName("no-update")
+            .description("don't update the lock file")
+            .set(&updateLock, false);
     }
 
     std::string name() override
@@ -78,8 +78,10 @@ struct CmdBuild : MixDryRun, InstallablesCommand
                     }
         }
 
-        if (gitRepo)
-            updateLockFile(*evalState, *gitRepo);
+        if(updateLock)
+            for (int i = 0; i < installables.size(); i++)
+                if (auto flakeUri = installableToFlakeUri)
+                    updateLockFile(*evalState, FlakeRef(*flakeUri));
     }
 };