diff --git a/src/win32/generated_include/ompi_config.h b/src/win32/generated_include/ompi_config.h
index 401f8b8761..0def4f99e6 100644
--- a/src/win32/generated_include/ompi_config.h
+++ b/src/win32/generated_include/ompi_config.h
@@ -548,6 +548,8 @@
    this to be _I32_MAX for now FIXME */
 #define OMPI_FORTRAN_HANDLE_MAX _I32_MAX
 
+#define OMPI_ASSEMBLY_ARCH OMPI_WINDOWS
+
 #define OMPI_WANT_MPI2_ONE_SIDED 1
 
 #include "ompi_config_bottom.h"