diff --git a/src/USER-DRUDE/fix_drude_transform.cpp b/src/USER-DRUDE/fix_drude_transform.cpp
index bdb5d95acc..34742a0683 100644
--- a/src/USER-DRUDE/fix_drude_transform.cpp
+++ b/src/USER-DRUDE/fix_drude_transform.cpp
@@ -314,6 +314,6 @@ void FixDrudeTransform<inverse>::unpack_forward_comm(int n, int first, double *b
 }
 
 /* ---------------------------------------------------------------------- */
-template class FixDrudeTransform<false>;
-template class FixDrudeTransform<true>;
+template class LAMMPS_NS::FixDrudeTransform<false>;
+template class LAMMPS_NS::FixDrudeTransform<true>;
 
diff --git a/src/USER-SMD/fix_smd_integrate_ulsph.h b/src/USER-SMD/fix_smd_integrate_ulsph.h
index ea4f46ce53..9d954bf529 100644
--- a/src/USER-SMD/fix_smd_integrate_ulsph.h
+++ b/src/USER-SMD/fix_smd_integrate_ulsph.h
@@ -48,7 +48,7 @@ class FixSMDIntegrateUlsph : public Fix {
  private:
   class NeighList *list;
  protected:
-  double dtv,dtf, vlimit, vlimitsq;;
+  double dtv,dtf, vlimit, vlimitsq;
   int mass_require;
   bool xsphFlag;
   bool adjust_radius_flag;
diff --git a/src/USER-UEF/fix_nh_uef.h b/src/USER-UEF/fix_nh_uef.h
index 43f5bb46a9..0629db5aa1 100644
--- a/src/USER-UEF/fix_nh_uef.h
+++ b/src/USER-UEF/fix_nh_uef.h
@@ -23,7 +23,7 @@ namespace LAMMPS_NS {
   // forward declaration
   namespace UEF_utils {
     class UEFBox;
-  };
+  }
 
 class FixNHUef : public FixNH {
  public: