diff --git xpcom/base/nsMemoryInfoDumper.cpp xpcom/base/nsMemoryInfoDumper.cpp
index 0b2f78c..d857374 100644
--- xpcom/base/nsMemoryInfoDumper.cpp
+++ xpcom/base/nsMemoryInfoDumper.cpp
@@ -30,7 +30,7 @@
 #include <unistd.h>
 #endif
 
-#ifdef XP_LINUX
+#if defined(XP_LINUX) || defined(__FreeBSD__)
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -109,7 +109,7 @@ private:
 
 } // anonymous namespace
 
-#ifdef XP_LINUX // {
+#if defined(XP_LINUX) || defined(__FreeBSD__) // {
 namespace {
 
 /*
@@ -548,7 +548,7 @@ nsMemoryInfoDumper::~nsMemoryInfoDumper(
 /* static */ void
 nsMemoryInfoDumper::Initialize()
 {
-#ifdef XP_LINUX
+#if defined(XP_LINUX) || defined(__FreeBSD__)
   SignalPipeWatcher::Create();
   FifoWatcher::MaybeCreate();
 #endif
diff --git xpcom/base/nsMemoryReporterManager.cpp xpcom/base/nsMemoryReporterManager.cpp
index 8c65665..8f6d0e9 100644
--- xpcom/base/nsMemoryReporterManager.cpp
+++ xpcom/base/nsMemoryReporterManager.cpp
@@ -824,7 +824,7 @@ nsMemoryReporterManager::Init()
     RegisterReporter(new mozilla::dmd::DMDReporter);
 #endif
 
-#if defined(XP_LINUX)
+#if defined(XP_LINUX) || defined(__FreeBSD__)
     nsMemoryInfoDumper::Initialize();
 #endif