--- a/CommonSource/DataStructures/UnorderedMap.h
+++ b/CommonSource/DataStructures/UnorderedMap.h
@@ -42,13 +42,9 @@
 
 #else // all decent C++ compilers
 
-#ifdef WIN32
 #include <unordered_map>
-#else // Linux
-#include <tr1/unordered_map>
-#endif
 
-using namespace std::tr1;
+using namespace std;
 
 #endif
 
--- a/CommonSource/DataStructures/UnorderedSet.h
+++ b/CommonSource/DataStructures/UnorderedSet.h
@@ -42,13 +42,9 @@
 
 #else // all decent C++ compilers
 
-#ifdef WIN32
 #include <unordered_set>
-#else // Linux
-#include <tr1/unordered_set>
-#endif
 
-using namespace std::tr1;
+using namespace std;
 
 #endif
 
--- a/CommonSource/Utilities/RegexUtilities.h
+++ b/CommonSource/Utilities/RegexUtilities.h
@@ -12,10 +12,7 @@
 #define REGEXUTILITIES_H_
 
 #include <iostream>
-#ifdef WIN32
 #include <regex>
-using namespace std::tr1;
-#endif
 #include <string>
 #include <vector>
 #include <cstdlib>
--- a/MosaikBuild/MosaikBuild.h
+++ b/MosaikBuild/MosaikBuild.h
@@ -15,10 +15,7 @@
 #include <iostream>
 #include <fstream>
 #include <map>
-#ifdef WIN32
 #include <regex>
-using namespace std::tr1;
-#endif
 #include <set>
 #include <sstream>
 #include "ColorspaceUtilities.h"