1 files changed, 1 insertions, 0 deletions
diff --git a/dive.h b/dive.h
index 7cd67fa27..144726135 100644
--- a/dive.h
+++ b/dive.h
@@ -99,6 +99,7 @@ extern double get_weight_units(unsigned int grams, int *frac, const char **units
 extern double get_vertical_speed_units(unsigned int mms, int *frac, const char **units);
 
 extern unsigned int units_to_depth(double depth);
+extern int units_to_sac(int volume);
 
 /* Volume in mliter of a cylinder at pressure 'p' */
 extern int gas_volume(cylinder_t *cyl, pressure_t p);