diff --git a/xpcom/base/nsMemoryInfoDumper.cpp b/xpcom/base/nsMemoryInfoDumper.cpp
index 0b2f78cdc0b9..d857374ed396 100644
--- a/xpcom/base/nsMemoryInfoDumper.cpp
+++ b/xpcom/base/nsMemoryInfoDumper.cpp
@@ -6,7 +6,7 @@
 
 #include "mozilla/nsMemoryInfoDumper.h"
 
-#ifdef XP_LINUX
+#if defined(XP_LINUX) || defined(__FreeBSD__)
 #include "mozilla/Preferences.h"
 #endif
 #include "mozilla/unused.h"
@@ -31,7 +31,7 @@
 #include <unistd.h>
 #endif
 
-#ifdef XP_LINUX
+#if defined(XP_LINUX) || defined(__FreeBSD__)
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -110,7 +110,7 @@ private:
 
 } // anonymous namespace
 
-#ifdef XP_LINUX // {
+#if defined(XP_LINUX) || defined(__FreeBSD__) // {
 namespace {
 
 /*
@@ -552,7 +552,7 @@ nsMemoryInfoDumper::~nsMemoryInfoDumper()
 /* static */ void
 nsMemoryInfoDumper::Initialize()
 {
-#ifdef XP_LINUX
+#if defined(XP_LINUX) || defined(__FreeBSD__)
   SignalPipeWatcher::Create();
   FifoWatcher::MaybeCreate();
 #endif
diff --git a/xpcom/base/nsMemoryReporterManager.cpp b/xpcom/base/nsMemoryReporterManager.cpp
index 1252e270cf33..6f22093ed9d5 100644
--- a/xpcom/base/nsMemoryReporterManager.cpp
+++ b/xpcom/base/nsMemoryReporterManager.cpp
@@ -17,7 +17,7 @@
 #include "nsPIDOMWindow.h"
 #include "nsIObserverService.h"
 #include "nsIGlobalObject.h"
-#if defined(XP_LINUX)
+#if defined(XP_LINUX) || defined(__FreeBSD__)
 #include "nsMemoryInfoDumper.h"
 #endif
 #include "mozilla/Attributes.h"
@@ -898,7 +898,7 @@ nsMemoryReporterManager::Init()
     RegisterStrongReporter(new mozilla::dmd::DMDReporter());
 #endif
 
-#if defined(XP_LINUX)
+#if defined(XP_LINUX) || defined(__FreeBSD__)
     nsMemoryInfoDumper::Initialize();
 #endif