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-rw-r--r--src/unit-category.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/unit-category.h b/src/unit-category.h
index c5e699c..76c375b 100644
--- a/src/unit-category.h
+++ b/src/unit-category.h
@@ -49,7 +49,7 @@ void unit_category_add_unit(UnitCategory *category, Unit *unit);
const GList *unit_category_get_units(UnitCategory *category);
-gboolean unit_category_convert(UnitCategory *category, const MPNumber *x, Unit *x_units, Unit *z_units, MPNumber *z);
+gboolean unit_category_convert(const UnitCategory *category, const MPNumber *x, Unit *x_units, Unit *z_units, MPNumber *z);
G_END_DECLS