diff --git a/dom/base/CCGCScheduler.h b/dom/base/CCGCScheduler.h
index ffc16d6feaa2..831759cd2477 100644
--- a/dom/base/CCGCScheduler.h
+++ b/dom/base/CCGCScheduler.h
@@ -63,9 +63,9 @@ static const int64_t kNumCCNodesBetweenTimeChecks = 1000;
 
 // Actions performed by the GCRunner state machine.
 enum class GCRunnerAction {
-  MajorGC,       // We want to start a new major GC
-  MajorGCReady,  // The parent says we may begin our major GC
-  GCSlice,       // Run a single slice of a major GC
+  WaitToMajorGC,  // We want to start a new major GC
+  StartMajorGC,   // The parent says we may begin our major GC
+  GCSlice,        // Run a single slice of a major GC
   None
 };
 
@@ -665,13 +665,13 @@ GCRunnerStep CCGCScheduler::GetNextGCRunnerAction(TimeStamp aDeadline) {
   }
 
   if (mReadyForMajorGC) {
-    GCRunnerStep step{GCRunnerAction::MajorGCReady, mMajorGCReason};
+    GCRunnerStep step{GCRunnerAction::StartMajorGC, mMajorGCReason};
     mMajorGCReason = JS::GCReason::NO_REASON;
     return step;
   }
 
   if (mMajorGCReason != JS::GCReason::NO_REASON) {
-    GCRunnerStep step{GCRunnerAction::MajorGC, mMajorGCReason};
+    GCRunnerStep step{GCRunnerAction::WaitToMajorGC, mMajorGCReason};
     mMajorGCReason = JS::GCReason::NO_REASON;
     return step;
   }
diff --git a/dom/base/nsJSEnvironment.cpp b/dom/base/nsJSEnvironment.cpp
index 2cb9928565c7..2b1cf2ba2100 100644
--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -1608,7 +1608,7 @@ bool GCRunnerFired(TimeStamp aDeadline, void* /* aClosure */) {
       nsJSContext::KillGCRunner();
       return false;
 
-    case GCRunnerAction::MajorGC: {
+    case GCRunnerAction::WaitToMajorGC: {
       RefPtr<MayGCPromise> mbPromise = MayGCNow(step.mReason);
       if (!mbPromise || mbPromise->IsResolved()) {
         // Only use the promise if it's not resolved yet, otherwise fall through
@@ -1638,7 +1638,7 @@ bool GCRunnerFired(TimeStamp aDeadline, void* /* aClosure */) {
 
       return true;
     }
-    case GCRunnerAction::MajorGCReady:
+    case GCRunnerAction::StartMajorGC:
     case GCRunnerAction::GCSlice:
       break;
   }