diff --git a/testdata/test3.heic b/testdata/test3.heic
new file mode 100644
index 0000000..bbe7b48
Binary files /dev/null and b/testdata/test3.heic differ
diff --git a/type_test.go b/type_test.go
index 48531ea..7c4b1fa 100644
--- a/type_test.go
+++ b/type_test.go
@@ -21,6 +21,7 @@ func TestDeterminateImageType(t *testing.T) {
 		// {"test.jp2", MAGICK},
 		{"test.heic", HEIF},
 		{"test2.heic", HEIF},
+		{"test3.heic", HEIF},
 	}
 
 	for _, file := range files {
diff --git a/vips.go b/vips.go
index 2e233eb..0d1cae5 100644
--- a/vips.go
+++ b/vips.go
@@ -693,6 +693,11 @@ func vipsImageType(buf []byte) ImageType {
 		// This is a HEIF file
 		return HEIF
 	}
+	if IsTypeSupported(HEIF) && buf[4] == 0x66 && buf[5] == 0x74 && buf[6] == 0x79 && buf[7] == 0x70 &&
+		buf[8] == 0x6d && buf[9] == 0x73 && buf[10] == 0x66 && buf[11] == 0x31 {
+		// This is a HEIFS file
+		return HEIF
+	}
 
 	return UNKNOWN
 }