diff --git a/src/PYTHON/fix_python.cpp b/src/PYTHON/fix_python.cpp
index 4f437b7488..a3ff292f9a 100644
--- a/src/PYTHON/fix_python.cpp
+++ b/src/PYTHON/fix_python.cpp
@@ -11,6 +11,7 @@
    See the README file in the top-level LAMMPS directory.
 ------------------------------------------------------------------------- */
 
+#include <Python.h>
 #include <stdio.h>
 #include <string.h>
 #include "fix_python.h"