diff --git a/include/coreinit/filesystem.h b/include/coreinit/filesystem.h
index 3616407..175473c 100644
--- a/include/coreinit/filesystem.h
+++ b/include/coreinit/filesystem.h
@@ -153,7 +153,7 @@ struct FSCmdBlock
 };
 WUT_CHECK_SIZE(FSCmdBlock, 0xA80);
 
-struct  __attribute__((packed)) FSStat
+struct WUT_PACKED FSStat
 {
    FSStatFlags flags;
    FSMode mode;
diff --git a/include/coreinit/mcp.h b/include/coreinit/mcp.h
index d027a20..ec3a635 100644
--- a/include/coreinit/mcp.h
+++ b/include/coreinit/mcp.h
@@ -23,7 +23,7 @@ typedef enum MCPInstallTarget
    MCP_INSTALL_TARGET_USB  = 1,
 } MCPInstallTarget;
 
-struct __attribute__((__packed__)) MCPInstallProgress
+struct WUT_PACKED MCPInstallProgress
 {
    uint32_t inProgress;
    uint64_t tid;
diff --git a/include/wut_structsize.h b/include/wut_structsize.h
index f661235..fb89b37 100644
--- a/include/wut_structsize.h
+++ b/include/wut_structsize.h
@@ -26,5 +26,8 @@
 #define WUT_UNKNOWN_BYTES(Size) char WUT_PP_CAT(__unk, __COUNTER__) [Size]
 #define WUT_PADDING_BYTES(Size) WUT_UNKNOWN_BYTES(Size)
 
-//! Unknown struct size
+// Unknown struct size
 #define WUT_UNKNOWN_SIZE(x)
+
+// Marks a struct as packed
+#define WUT_PACKED  __attribute__((__packed__))