diff --git a/dlls/comctl32/dsa.c b/dlls/comctl32/dsa.c
index a73a54ad742..d5e82343fbd 100644
--- a/dlls/comctl32/dsa.c
+++ b/dlls/comctl32/dsa.c
@@ -267,6 +267,9 @@ INT WINAPI DSA_InsertItem (HDSA hdsa, INT nIndex, LPVOID pSrc)
         nNewItems = hdsa->nMaxCount + hdsa->nGrow;
         nSize = hdsa->nItemSize * nNewItems;
 
+        if (nSize / hdsa->nItemSize != nNewItems)
+            return -1;
+
         lpTemp = ReAlloc (hdsa->pData, nSize);
         if (!lpTemp)
             return -1;