diff --git a/math/py-yt/Makefile b/math/py-yt/Makefile
index 3c4b0afafbd98..a89a91f6de903 100644
--- a/math/py-yt/Makefile
+++ b/math/py-yt/Makefile
@@ -12,6 +12,8 @@ COMMENT=	Analysis and visualization toolkit for volumetric data
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING.txt
 
+BROKEN_i386=	call to 'countOnes' is ambiguous, see https://github.com/yt-project/yt/issues/3477
+
 # dependencies are in setup.cfg
 BUILD_DEPENDS=	${PYNUMPY}
 RUN_DEPENDS=	\