1 files changed, 2 insertions, 0 deletions
diff --git a/dive.h b/dive.h
index 85fdabf5d..fc458d04d 100644
--- a/dive.h
+++ b/dive.h
@@ -86,6 +86,8 @@ typedef struct {
 	pressure_t start, end;
 } cylinder_t;
 
+extern double get_depth_units(unsigned int mm, int *frac, const char **units);
+
 static inline double mm_to_feet(int mm)
 {
 	return mm * 0.00328084;