diff --git a/dlls/wined3d/vertexdeclaration.c b/dlls/wined3d/vertexdeclaration.c
index 924db6a1c4f..a62ac0116dc 100644
--- a/dlls/wined3d/vertexdeclaration.c
+++ b/dlls/wined3d/vertexdeclaration.c
@@ -175,7 +175,7 @@ static HRESULT WINAPI IWineD3DVertexDeclarationImpl_SetDeclaration(IWineD3DVerte
                   (This->swizzled_attribs[j].usage == This->pDeclarationWine[i].Usage &&
                    This->swizzled_attribs[j].idx   >   This->pDeclarationWine[i].UsageIndex)) {
                     memmove(&This->swizzled_attribs[j + 1], &This->swizzled_attribs[j],
-                             sizeof(This->swizzled_attribs) - (sizeof(This->swizzled_attribs[0]) * (j - 1)));
+                             sizeof(This->swizzled_attribs) - (sizeof(This->swizzled_attribs[0]) * (j + 1)));
                     break;
                 }
             }
diff --git a/dlls/wined3d/vertexshader.c b/dlls/wined3d/vertexshader.c
index bd4c2c11aa0..37a3705c7f5 100644
--- a/dlls/wined3d/vertexshader.c
+++ b/dlls/wined3d/vertexshader.c
@@ -336,7 +336,7 @@ static inline void find_swizzled_attribs(IWineD3DVertexDeclaration *declaration,
                oldswizzles[i].usage == This->swizzled_attribs[j].usage &&
                oldswizzles[i].idx > This->swizzled_attribs[j].idx)) {
                 memmove(&This->swizzled_attribs[j + 1], &This->swizzled_attribs[j],
-                         sizeof(This->swizzled_attribs) - (sizeof(This->swizzled_attribs[0]) * (j - 1)));
+                         sizeof(This->swizzled_attribs) - (sizeof(This->swizzled_attribs[0]) * (j + 1)));
                 break;
             }
         }