diff --git a/dlls/ole32/stg_prop.c b/dlls/ole32/stg_prop.c
index 8e1aaef0472..a2598832bf1 100644
--- a/dlls/ole32/stg_prop.c
+++ b/dlls/ole32/stg_prop.c
@@ -2178,7 +2178,7 @@ static HRESULT WINAPI IPropertySetStorage_fnCreate(
     IPropertyStorage** ppprstg)
 {
     StorageImpl *This = impl_from_IPropertySetStorage(ppstg);
-    WCHAR name[CCH_MAX_PROPSTG_NAME];
+    WCHAR name[CCH_MAX_PROPSTG_NAME + 1];
     IStream *stm = NULL;
     HRESULT r;
 
@@ -2236,7 +2236,7 @@ static HRESULT WINAPI IPropertySetStorage_fnOpen(
 {
     StorageImpl *This = impl_from_IPropertySetStorage(ppstg);
     IStream *stm = NULL;
-    WCHAR name[CCH_MAX_PROPSTG_NAME];
+    WCHAR name[CCH_MAX_PROPSTG_NAME + 1];
     HRESULT r;
 
     TRACE("%p %s %08x %p\n", This, debugstr_guid(rfmtid), grfMode, ppprstg);
@@ -2280,7 +2280,7 @@ static HRESULT WINAPI IPropertySetStorage_fnDelete(
     REFFMTID rfmtid)
 {
     StorageImpl *This = impl_from_IPropertySetStorage(ppstg);
-    WCHAR name[CCH_MAX_PROPSTG_NAME];
+    WCHAR name[CCH_MAX_PROPSTG_NAME + 1];
     HRESULT r;
 
     TRACE("%p %s\n", This, debugstr_guid(rfmtid));