diff --git a/src/lammps.cpp b/src/lammps.cpp
index 809f0299da..0e3ec7d062 100644
--- a/src/lammps.cpp
+++ b/src/lammps.cpp
@@ -19,9 +19,6 @@
 #include <cctype>
 #include <map>
 #include <string>
-#ifdef FFT_FFTW3
-#include <fftw3.h>
-#endif
 #include "style_angle.h"     // IWYU pragma: keep
 #include "style_atom.h"      // IWYU pragma: keep
 #include "style_bond.h"      // IWYU pragma: keep
@@ -1318,15 +1315,3 @@ void LAMMPS::print_config(FILE *fp)
   }
   fputs("\n\n",fp);
 }
-
-void LAMMPS::cleanup() {
-#ifdef FFT_FFTW3
-  // tell fftw3 to delete its global memory pool
-  // and thus avoid bogus valgrind memory leak reports
-#ifdef FFT_SINGLE
-  fftwf_cleanup();
-#else
-  fftw_cleanup();
-#endif
-#endif
-}
diff --git a/src/lammps.h b/src/lammps.h
index 8029ffab3e..dc2916f214 100644
--- a/src/lammps.h
+++ b/src/lammps.h
@@ -79,7 +79,6 @@ class LAMMPS {
   void post_create();
   void init();
   void destroy();
-  void cleanup();
   void print_config(FILE *);    // print compile time settings
 
  private:
diff --git a/src/main.cpp b/src/main.cpp
index d89ba11668..2f0d953fd7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -59,7 +59,6 @@ int main(int argc, char **argv)
 #else
   LAMMPS *lammps = new LAMMPS(argc,argv,MPI_COMM_WORLD);
   lammps->input->file();
-  lammps->cleanup();
   delete lammps;
 #endif
   MPI_Barrier(MPI_COMM_WORLD);