diff --git a/libvips/foreign/magick.c b/libvips/foreign/magick.c
index 1cf7ef1ce9..876cab3f26 100644
--- a/libvips/foreign/magick.c
+++ b/libvips/foreign/magick.c
@@ -138,6 +138,15 @@ magick_sniff(const unsigned char *bytes, size_t length)
(bytes[4] != 0 || bytes[5] != 0))
return "ICO";
+ if (length >= 8 &&
+ bytes[1] == 0 &&
+ bytes[2] == 0 &&
+ bytes[5] == 0 &&
+ bytes[6] == 0 &&
+ (bytes[4] == 7 ||
+ bytes[7] == 7))
+ return "XWD";
+
if (length >= 18 &&
(bytes[1] == 0 ||
bytes[1] == 1) &&
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