diff --git a/dlls/ole32/filemoniker.c b/dlls/ole32/filemoniker.c
index ff543aa7f7..72f59136f7 100644
--- a/dlls/ole32/filemoniker.c
+++ b/dlls/ole32/filemoniker.c
@@ -1048,7 +1048,7 @@ int FileMonikerImpl_DecomposePath(LPCOLESTR str, LPOLESTR** stringTable)
 
     TRACE("%s, %p\n", debugstr_w(str), *stringTable);
 
-    strgtable = CoTaskMemAlloc(len*sizeof(*strgtable));
+    strgtable = CoTaskMemAlloc((len + 1)*sizeof(*strgtable));
 
     if (strgtable==NULL)
 	return E_OUTOFMEMORY;