diff --git a/dlls/urlmon/axinstall.c b/dlls/urlmon/axinstall.c
index ca1aef682cc..7ee7d9456f5 100644
--- a/dlls/urlmon/axinstall.c
+++ b/dlls/urlmon/axinstall.c
@@ -447,7 +447,7 @@ static HRESULT install_file(install_ctx_t *ctx, const WCHAR *cache_file)
         if(!ext)
             ext = ptr;
 
-        if(!strcmpW(ext, cab_extW)) {
+        if(!strcmpiW(ext, cab_extW)) {
             hres = install_cab_file(ctx);
         }else {
             FIXME("Unsupported extension %s\n", debugstr_w(ext));