diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextMach_arm.cpp b/lldb/source/Plugins/Process/Utility/RegisterContextMach_arm.cpp
index a36634f759f7..7ceb536272f4 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextMach_arm.cpp
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextMach_arm.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(__APPLE__)
+
 #include "RegisterContextMach_arm.h"
 
 // C Includes
@@ -82,4 +84,4 @@ RegisterContextMach_arm::DoWriteDBG (lldb::tid_t tid, int flavor, const DBG &dbg
     return ::thread_set_state(tid, flavor, (thread_state_t)&dbg, DBGWordCount);
 }
 
-
+#endif
diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextMach_i386.cpp b/lldb/source/Plugins/Process/Utility/RegisterContextMach_i386.cpp
index 62b50956678c..3d6c9a6baca6 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextMach_i386.cpp
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextMach_i386.cpp
@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(__APPLE__)
 
 // C Includes
 #include <mach/thread_act.h>
@@ -68,4 +69,4 @@ RegisterContextMach_i386::DoWriteEXC (lldb::tid_t tid, int flavor, const EXC &ex
     return ::thread_set_state(tid, flavor, (thread_state_t)&exc, EXCWordCount);
 }
 
-
+#endif
diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextMach_x86_64.cpp b/lldb/source/Plugins/Process/Utility/RegisterContextMach_x86_64.cpp
index 9746ec95428e..f03685e1313f 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextMach_x86_64.cpp
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextMach_x86_64.cpp
@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(__APPLE__)
 
 // C Includes
 #include <mach/thread_act.h>
@@ -68,3 +69,4 @@ RegisterContextMach_x86_64::DoWriteEXC (lldb::tid_t tid, int flavor, const EXC &
     return ::thread_set_state(tid, flavor, (thread_state_t)&exc, EXCWordCount);
 }
 
+#endif