diff --git a/math/fftw/Makefile b/math/fftw/Makefile
index d09824493922..d7083119f1a2 100644
--- a/math/fftw/Makefile
+++ b/math/fftw/Makefile
@@ -28,6 +28,7 @@ USE_FORTRAN=	yes
 USE_GMAKE=	yes
 USE_AUTOTOOLS=	aclocal automake autoconf libtool
 ACLOCAL_ARGS=	-I ${LOCALBASE}/share/aclocal
+AUTOMAKE_ARGS=	--add-missing
 CONFIGURE_ENV=	MAKEINFO="makeinfo --no-split"
 CONFIGURE_ARGS=	--enable-shared
 USE_LDCONFIG=	yes