diff --git a/src/MC/fix_sgcmc.cpp b/src/MC/fix_sgcmc.cpp
index 1cdb023450..a1a2931725 100644
--- a/src/MC/fix_sgcmc.cpp
+++ b/src/MC/fix_sgcmc.cpp
@@ -50,7 +50,6 @@
 #include <algorithm>
 #include <cmath>
 #include <cstring>
-#include <vector>
 
 using namespace LAMMPS_NS;
 using namespace FixConst;
diff --git a/src/MC/fix_sgcmc.h b/src/MC/fix_sgcmc.h
index 7a02141564..e2cd15ec2f 100644
--- a/src/MC/fix_sgcmc.h
+++ b/src/MC/fix_sgcmc.h
@@ -42,7 +42,7 @@ class FixSemiGrandCanonicalMC : public Fix {
 
   int setmask() override;
   void init() override;
-  void init_list(int id, NeighList *ptr) override;
+  void init_list(int id, class NeighList *ptr) override;
   void post_force(int vflag) override;
   double compute_vector(int index) override;