diff --git a/dlls/windows.globalization/main.c b/dlls/windows.globalization/main.c
index 3e5a59bde14..21ea2908679 100644
--- a/dlls/windows.globalization/main.c
+++ b/dlls/windows.globalization/main.c
@@ -54,9 +54,11 @@ struct hstring_vector
     LONG ref;
 
     ULONG count;
-    HSTRING values[1];
+    HSTRING values[];
 };
 
+C_ASSERT(sizeof(struct hstring_vector) == offsetof(struct hstring_vector, values[0]));
+
 static inline struct hstring_vector *impl_from_IVectorView_HSTRING(IVectorView_HSTRING *iface)
 {
     return CONTAINING_RECORD(iface, struct hstring_vector, IVectorView_HSTRING_iface);