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-rw-r--r--core/dive.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/core/dive.h b/core/dive.h
index 4c24dad74..0cc3150ce 100644
--- a/core/dive.h
+++ b/core/dive.h
@@ -423,7 +423,7 @@ extern struct dive_trip *clone_empty_trip(struct dive_trip *trip);
extern const struct units SI_units, IMPERIAL_units;
extern struct units xml_parsing_units;
-extern struct units *get_units(void);
+extern const struct units *get_units(void);
extern int run_survey, verbose, quit, force_root;
struct dive_table {