diff -r fd948e5af26e -r 2cbdb482d325 src/buffer.c
--- a/src/buffer.c	Thu Dec 04 18:57:54 2025 +0100
+++ b/src/buffer.c	Fri Dec 05 16:11:39 2025 +0100
@@ -32,35 +32,6 @@
 #include <string.h>
 #include <errno.h>
 
-#ifdef _WIN32
-#include <Windows.h>
-#include <sysinfoapi.h>
-static unsigned long system_page_size(void) {
-    static unsigned long ps = 0;
-    if (ps == 0) {
-        SYSTEM_INFO sysinfo;
-        GetSystemInfo(&sysinfo);
-        ps = sysinfo.dwPageSize;
-    }
-    return ps;
-}
-#else
-#include <unistd.h>
-static unsigned long system_page_size(void) {
-    static unsigned long ps = 0;
-    if (ps == 0) {
-        long sc = sysconf(_SC_PAGESIZE);
-        if (sc < 0) {
-            // fallback for systems which do not report a value here
-            ps = 4096; // LCOV_EXCL_LINE
-        } else {
-            ps = (unsigned long) sc;
-        }
-    }
-    return ps;
-}
-#endif
-
 static int buffer_copy_on_write(CxBuffer* buffer) {
     if (0 == (buffer->flags & CX_BUFFER_COPY_ON_WRITE)) return 0;
     void *newspace = cxMalloc(buffer->allocator, buffer->capacity);
@@ -262,7 +233,7 @@
 }
 
 static size_t cx_buffer_calculate_minimum_capacity(size_t mincap) {
-    unsigned long pagesize = system_page_size();
+    unsigned long pagesize = cx_system_page_size();
     // if page size is larger than 64 KB - for some reason - truncate to 64 KB
     if (pagesize > 65536) pagesize = 65536;
     if (mincap < pagesize) {