diff --git a/src/libstore/build/drv-output-substitution-goal.cc b/src/libstore/build/drv-output-substitution-goal.cc
index 5e83d769c..94c9206a3 100644
--- a/src/libstore/build/drv-output-substitution-goal.cc
+++ b/src/libstore/build/drv-output-substitution-goal.cc
@@ -41,13 +41,13 @@ void DrvOutputSubstitutionGoal::tryNext()
     /* Make sure that we are allowed to start a substitution.  Note that even
        if maxSubstitutionJobs == 0, we still allow a substituter to run. This
        prevents infinite waiting. */
-    if (worker.runningCASubstitutions >= std::max(1U, settings.maxSubstitutionJobs.get())) {
+    if (worker.runningSubstitutions >= std::max(1U, settings.maxSubstitutionJobs.get())) {
         worker.waitForBuildSlot(shared_from_this());
         return;
     }
 
     maintainRunningSubstitutions =
-        std::make_unique<MaintainCount<uint64_t>>(worker.runningCASubstitutions);
+        std::make_unique<MaintainCount<uint64_t>>(worker.runningSubstitutions);
 
     if (subs.size() == 0) {
         /* None left.  Terminate this goal and let someone else deal
diff --git a/src/libstore/build/worker.hh b/src/libstore/build/worker.hh
index eee47e23d..3984c9c1c 100644
--- a/src/libstore/build/worker.hh
+++ b/src/libstore/build/worker.hh
@@ -146,7 +146,6 @@ public:
     uint64_t doneSubstitutions = 0;
     uint64_t failedSubstitutions = 0;
     uint64_t runningSubstitutions = 0;
-    uint64_t runningCASubstitutions = 0;
     uint64_t expectedDownloadSize = 0;
     uint64_t doneDownloadSize = 0;
     uint64_t expectedNarSize = 0;