--- a/js/src/vm/HelperThreads.cpp
+++ b/js/src/vm/HelperThreads.cpp
@@ -464,17 +464,17 @@ GlobalHelperThreadState::ensureInitializ
 }
 
 GlobalHelperThreadState::GlobalHelperThreadState()
  : cpuCount(0),
    threadCount(0),
    threads(nullptr),
    asmJSCompilationInProgress(false),
    helperLock(nullptr),
-#ifdef DEbUG
+#ifdef DEBUG
    lockOwner(nullptr),
 #endif
    consumerWakeup(nullptr),
    producerWakeup(nullptr),
    pauseWakeup(nullptr),
    numAsmJSFailedJobs(0),
    asmJSFailedFunction(nullptr)
 {