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-rw-r--r--libcrystfel/src/cell-utils.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/cell-utils.c b/libcrystfel/src/cell-utils.c
index d269e703..d5662971 100644
--- a/libcrystfel/src/cell-utils.c
+++ b/libcrystfel/src/cell-utils.c
@@ -868,7 +868,7 @@ static int get_angle_rad(char **bits, int nbits, double *pl)
* Writes \p cell to \p fh, in CrystFEL unit cell file format
*
*/
-void write_cell(UnitCell *cell, FILE *fh)
+void write_cell(const UnitCell *cell, FILE *fh)
{
double a, b, c, al, be, ga;
LatticeType lt;