diff --git a/src/library.cpp b/src/library.cpp
index 5773a677c1..c6c34a529f 100644
--- a/src/library.cpp
+++ b/src/library.cpp
@@ -3840,7 +3840,7 @@ Please see :cpp:func:`lammps_has_style` for a list of valid categories.
  * \return 1 if successful, otherwise 0
  */
 int lammps_style_name(void *handle, const char *category, int idx,
-                      const char *buffer, int buf_size) {
+                      char *buffer, int buf_size) {
   LAMMPS *lmp = (LAMMPS *) handle;
   Info info(lmp);
   auto styles = info.get_available_styles(category);
diff --git a/src/library.h b/src/library.h
index 1147cc4d9a..6c01be7867 100644
--- a/src/library.h
+++ b/src/library.h
@@ -163,7 +163,7 @@ int lammps_config_has_exceptions();
 
 int lammps_has_style(void *, const char *, const char *);
 int lammps_style_count(void *, const char *);
-int lammps_style_name(void *, const char *, int, const char *, int);
+int lammps_style_name(void *, const char *, int, char *, int);
 
 /* ----------------------------------------------------------------------
  * Library functions for accessing neighbor lists