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-rw-r--r--libcrystfel/src/crystal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/crystal.h b/libcrystfel/src/crystal.h
index b4726cce..f4c7477b 100644
--- a/libcrystfel/src/crystal.h
+++ b/libcrystfel/src/crystal.h
@@ -57,7 +57,7 @@ extern void crystal_free(Crystal *cryst);
extern UnitCell *crystal_get_cell(Crystal *cryst);
extern const UnitCell *crystal_get_cell_const(const Crystal *cryst);
-extern double crystal_get_profile_radius(Crystal *cryst);
+extern double crystal_get_profile_radius(const Crystal *cryst);
extern RefList *crystal_get_reflections(Crystal *cryst);
extern double crystal_get_resolution_limit(Crystal *cryst);
extern long long int crystal_get_num_saturated_reflections(Crystal *cryst);