--- a/xpcom/base/moz.build
+++ b/xpcom/base/moz.build
@@ -81,25 +81,30 @@ EXPORTS.mozilla += [
     'VisualEventTracer.h',
 ]
 
 if CONFIG['OS_ARCH'] == 'WINNT':
     EXPORTS.mozilla += [
         'WindowsVersion.h',
     ]
 
+# nsDebugImpl isn't unified because we disable PGO so that NS_ABORT_OOM isn't
+# optimized away oddly.
+SOURCES += [
+    'nsDebugImpl.cpp',
+]
+
 UNIFIED_SOURCES += [
     'AvailableMemoryTracker.cpp',
     'ClearOnShutdown.cpp',
     'CycleCollectedJSRuntime.cpp',
     'Debug.cpp',
     'nsConsoleMessage.cpp',
     'nsConsoleService.cpp',
     'nsCycleCollector.cpp',
-    'nsDebugImpl.cpp',
     'nsErrorService.cpp',
     'nsGZFileWriter.cpp',
     'nsInterfaceRequestorAgg.cpp',
     'nsMemoryImpl.cpp',
     'nsMemoryInfoDumper.cpp',
     'nsMemoryReporterManager.cpp',
     'nsMessageLoop.cpp',
     'nsSecurityConsoleMessage.cpp',