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-rw-r--r--src/tools/imgtool/formats/vt_dsk.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/tools/imgtool/formats/vt_dsk.cpp b/src/tools/imgtool/formats/vt_dsk.cpp
index c29d08ba88b..a0949ec2575 100644
--- a/src/tools/imgtool/formats/vt_dsk.cpp
+++ b/src/tools/imgtool/formats/vt_dsk.cpp
@@ -47,7 +47,7 @@ static FLOPPY_CONSTRUCT(vz_construct)
}
-LEGACY_FLOPPY_OPTIONS_START(vz)
+extern LEGACY_FLOPPY_OPTIONS_START(vz)
LEGACY_FLOPPY_OPTION(vtech1, "dsk", "Laser/VZ disk image", vz_identify, vz_construct, NULL,
HEADS([1])
TRACKS([40])