diff --git a/reactos/ntoskrnl/include/internal/kbd.h b/reactos/ntoskrnl/include/internal/kbd.h
index 501df97edae..e2988da4b30 100644
--- a/reactos/ntoskrnl/include/internal/kbd.h
+++ b/reactos/ntoskrnl/include/internal/kbd.h
@@ -17,7 +17,7 @@ extern "C" {
   typedef struct _MODIFIERS {
     PVK_TO_BIT pVkToBit;
     WORD wMaxModBits;
-    BYTE ModNumber[1];
+    BYTE ModNumber[];
   } MODIFIERS, *PMODIFIERS;
 
 #define TYPEDEF_VK_TO_WCHARS(i) \