diff --git a/platforms/common/include/px4_platform_common/posix.h b/platforms/common/include/px4_platform_common/posix.h
index b1cada1019..8b8c16069f 100644
--- a/platforms/common/include/px4_platform_common/posix.h
+++ b/platforms/common/include/px4_platform_common/posix.h
@@ -131,7 +131,14 @@ __END_DECLS
 // we often run out of stack space when pointers are larger than 4 bytes.
 // Double the stack size on posix when we're on a 64-bit architecture.
 // Most full-scale OS use 1-4K of memory from the stack themselves
-#define PX4_STACK_ADJUSTED(_s) ((_s) * (sizeof(void *) >> 2) + PX4_STACK_OVERHEAD)
+#ifndef __SIZEOF_POINTER__
+#  if defined(_WIN64) || (defined(_MSC_VER) && defined(_M_X64))
+#    define __SIZEOF_POINTER__ 8
+#  else
+#    define __SIZEOF_POINTER__ 4
+#  endif
+#endif
+#define PX4_STACK_ADJUSTED(_s) ((_s) * (__SIZEOF_POINTER__ >> 2) + PX4_STACK_OVERHEAD)
 
 __BEGIN_DECLS