diff --git a/src/Common/PlatformLinux.inl b/src/Common/PlatformLinux.inl
index fcdf140c8a2..a65ea5b68fe 100644
--- a/src/Common/PlatformLinux.inl
+++ b/src/Common/PlatformLinux.inl
@@ -12,7 +12,6 @@
 #include <limits.h> // for PAGESIZE...
 #include <math.h>
 #include <sched.h>
-#include <stddef.h>
 
 #include <algorithm> // for min max
 
diff --git a/src/xrCore/xrstring.h b/src/xrCore/xrstring.h
index 2c0b837450d..e0d42e6fee0 100644
--- a/src/xrCore/xrstring.h
+++ b/src/xrCore/xrstring.h
@@ -88,7 +88,7 @@ class shared_str
         _dec();
         p_ = v;
     }
-    void _set(nullptr_t) noexcept
+    void _set(std::nullptr_t) noexcept
     {
         _dec();
         p_ = nullptr;
@@ -133,7 +133,7 @@ class shared_str
         rhs.p_ = nullptr;
         return *this;
     }
-    shared_str& operator=(nullptr_t) noexcept
+    shared_str& operator=(std::nullptr_t) noexcept
     {
         _set(nullptr);
         return *this;