diff --git a/src/library.cpp b/src/library.cpp
index eac8e059ee7f1b386eef4e40f506a6ee81b15d72..992b8ba100d62209f607654baf999c78fa95d039 100644
--- a/src/library.cpp
+++ b/src/library.cpp
@@ -317,8 +317,6 @@ void lammps_free(void *ptr)
 
 int lammps_extract_setting(void *ptr, char *name)
 {
-  LAMMPS *lmp = (LAMMPS *) ptr;
-
   if (strcmp(name,"bigint") == 0) return sizeof(bigint);
   if (strcmp(name,"tagint") == 0) return sizeof(tagint);
   if (strcmp(name,"imageint") == 0) return sizeof(imageint);