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-rw-r--r--libcrystfel/src/cell.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/cell.h b/libcrystfel/src/cell.h
index cbe84772..bd2719dd 100644
--- a/libcrystfel/src/cell.h
+++ b/libcrystfel/src/cell.h
@@ -118,7 +118,7 @@ extern UnitCell *rotate_cell(UnitCell *in, double omega, double phi,
extern void cell_print(UnitCell *cell);
extern UnitCell *match_cell(UnitCell *cell, UnitCell *tempcell, int verbose,
- float *ltl, int reduce);
+ const float *ltl, int reduce);
extern UnitCell *match_cell_ab(UnitCell *cell, UnitCell *tempcell);