diff --git a/lib/mpi/mpi-inline.h b/lib/mpi/mpi-inline.h
index 3b176a50c5426..c245ea31f7853 100644
--- a/lib/mpi/mpi-inline.h
+++ b/lib/mpi/mpi-inline.h
@@ -30,7 +30,7 @@
 #define G10_MPI_INLINE_H
 
 #ifndef G10_MPI_INLINE_DECL
-#define G10_MPI_INLINE_DECL  inline
+#define G10_MPI_INLINE_DECL  static inline
 #endif
 
 G10_MPI_INLINE_DECL mpi_limb_t