diff --git a/dlls/windowscodecs/proxy.c b/dlls/windowscodecs/proxy.c
index 4df14c78ef8..c3209cc54cf 100644
--- a/dlls/windowscodecs/proxy.c
+++ b/dlls/windowscodecs/proxy.c
@@ -36,6 +36,12 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
 
+HRESULT WINAPI IWICColorContext_InitializeFromMemory_Proxy_W(IWICColorContext *iface,
+    const BYTE *pbBuffer, UINT cbBufferSize)
+{
+    return IWICColorContext_InitializeFromMemory(iface, pbBuffer, cbBufferSize);
+}
+
 HRESULT WINAPI IWICFastMetadataEncoder_Commit_Proxy_W(IWICFastMetadataEncoder *iface)
 {
     return IWICFastMetadataEncoder_Commit(iface);
diff --git a/dlls/windowscodecs/windowscodecs.spec b/dlls/windowscodecs/windowscodecs.spec
index 31b41d2bc0c..269fda579e3 100644
--- a/dlls/windowscodecs/windowscodecs.spec
+++ b/dlls/windowscodecs/windowscodecs.spec
@@ -52,7 +52,7 @@
 @ stub IWICBitmap_Lock_Proxy
 @ stub IWICBitmap_SetPalette_Proxy
 @ stub IWICBitmap_SetResolution_Proxy
-@ stub IWICColorContext_InitializeFromMemory_Proxy
+@ stdcall IWICColorContext_InitializeFromMemory_Proxy(ptr ptr long) IWICColorContext_InitializeFromMemory_Proxy_W
 @ stub IWICComponentFactory_CreateMetadataWriterFromReader_Proxy
 @ stub IWICComponentFactory_CreateQueryWriterFromBlockWriter_Proxy
 @ stub IWICComponentInfo_GetAuthor_Proxy