diff --git a/Source/Time/AuCivilTime.cpp b/Source/Time/AuCivilTime.cpp
index 6e32890c..a2f55e09 100644
--- a/Source/Time/AuCivilTime.cpp
+++ b/Source/Time/AuCivilTime.cpp
@@ -11,18 +11,10 @@
 #include "AuCivilTime.hpp"
 #include "Time.hpp"
 
-#if defined(AURORA_IS_POSIX_DERIVED)
-    
-    #include <sys/resource.h>
-    
-#elif defined(AURORA_IS_MODERNNT_DERIVED)
+#if defined(AURORA_IS_MODERNNT_DERIVED)
 
     #define timegm _mkgmtime
 
-#else
-    
-    using steady_clock = std::chrono::steady_clock;
-
 #endif
 
 using sys_clock = std::chrono::system_clock; // more stds to remove