diff --git a/src/libutil/logging.hh b/src/libutil/logging.hh
index 96ad69790..35f1facc5 100644
--- a/src/libutil/logging.hh
+++ b/src/libutil/logging.hh
@@ -20,6 +20,7 @@ typedef enum {
     actQueryPathInfo = 109,
     actPostBuildHook = 110,
     actBuildWaiting = 111,
+    actEvaluate = 112,
 } ActivityType;
 
 typedef enum {
diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index 3506c3fcc..202b08c80 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -356,6 +356,8 @@ struct InstallableStorePath : Installable
 
 Buildables InstallableValue::toBuildables()
 {
+    Activity act(*logger, lvlInfo, actEvaluate);
+
     Buildables res;
 
     std::map<StorePath, std::map<std::string, std::optional<StorePath>>> drvsToOutputs;