diff --git a/src/common/filesystem/source/critsec.cpp b/src/common/filesystem/source/critsec.cpp
index 874ade79f..b8b8c5522 100644
--- a/src/common/filesystem/source/critsec.cpp
+++ b/src/common/filesystem/source/critsec.cpp
@@ -31,8 +31,6 @@
 **
 */
 
-namespace FileSys {
-
 #ifdef _WIN32
 
 #ifndef _WINNT_
@@ -40,6 +38,8 @@ namespace FileSys {
 #include <windows.h>
 #endif
 
+namespace FileSys {
+
 class FInternalCriticalSection
 {
 public:
@@ -82,6 +82,8 @@ void LeaveCriticalSection(FInternalCriticalSection *c)
 
 #include <pthread.h>
 
+namespace FileSys {
+
 class FInternalCriticalSection
 {
 public: