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-rw-r--r--src/util/units.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/util/units.h b/src/util/units.h
index 2b7f8674c..48478c77c 100644
--- a/src/util/units.h
+++ b/src/util/units.h
@@ -22,6 +22,8 @@
#ifndef DOXYGEN_SHOULD_SKIP_THIS
+#define DEFAULT_UNIT_NAME "mm";
+
namespace std {
template <>
struct hash<Glib::ustring> : public std::unary_function<Glib::ustring, std::size_t> {