diff --git a/dlls/d3dx9_36/util.c b/dlls/d3dx9_36/util.c
index f7f3cf11cda..ddb54c35a36 100644
--- a/dlls/d3dx9_36/util.c
+++ b/dlls/d3dx9_36/util.c
@@ -151,6 +151,8 @@ const PixelFormatDesc *get_format_info(D3DFORMAT format)
 {
     unsigned int i = 0;
     while(formats[i].format != format && formats[i].format != D3DFMT_UNKNOWN) i++;
+    if(formats[i].format == D3DFMT_UNKNOWN)
+        FIXME("Unknown format %#x\n", format);
     return &formats[i];
 }