diff --git a/science/opensph/Makefile b/science/opensph/Makefile
index cfb928b022b3..d53ca3f702fa 100644
--- a/science/opensph/Makefile
+++ b/science/opensph/Makefile
@@ -9,6 +9,9 @@ COMMENT=	Library and graphical tools for running SPH and N-body simulations
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+ONLY_FOR_ARCHS=	amd64 i386
+ONLY_FOR_ARCHS_REASON=	unconditional use of -msse4.1 and inclusion of immintrin.h
+
 TEST_DEPENDS=	catch>0:devel/catch
 
 USES=		compiler:c++14-lang qmake qt:5