diff --git a/math/Imath/Makefile b/math/Imath/Makefile
index 9fa973911789..c2d5eea7d856 100644
--- a/math/Imath/Makefile
+++ b/math/Imath/Makefile
@@ -1,64 +1,65 @@
 # Based on the graphics/ilmbase port that was done by: nork@FreeBSD.org
 
 PORTNAME=	Imath
 PORTVERSION=	3.1.9
+DISTVERSIONPREFIX=	v
 PORTREVISION=	0
 CATEGORIES=	math devel graphics
 
 MAINTAINER=	mandree@FreeBSD.org
 COMMENT=	C++/Python lib of 2D/3D vector, matrix, math ops for computer graphics
 WWW=		https://github.com/AcademySoftwareFoundation/Imath/
 
 LICENSE=	BSD3CLAUSE
 
 USES=		cmake compiler:c++14-lang pathfix pkgconfig
 
 USE_GITHUB=	yes
-GH_TUPLE=	AcademySoftwareFoundation:Imath:v${PORTVERSION}
+GH_ACCOUNT=	AcademySoftwareFoundation
 USE_LDCONFIG=	yes
 
 CMAKE_ARGS+=	-DCMAKE_DEBUG_POSTFIX= \
 		-DCMAKE_INSTALL_PREFIX=${PREFIX}
 
 PATCH_STRIP=	-p1
 
 PLIST_SUB=	MAJORVER=${_MAJORVER} \
 		MINVER=${_MINVER} \
 		PLVER=${_PLVER} \
 		VER=${_VER} \
 		PYVER=${PYTHON_VER:S/./_/}
 PORTDOCS=	README.md
 
 OPTIONS_DEFINE=	DOCS LARGE_STACK PYTHON
 OPTIONS_SUB=	yes
 
 LARGE_STACK_DESC=	Enable sys-dependent large stack optimizations
 LARGE_STACK_CMAKE_BOOL=	IMATH_ENABLE_LARGE_STACK
 
 PYTHON_BUILD_DEPENDS=	${PYNUMPY}
 PYTHON_LIB_DEPENDS=	${PY_BOOST}
 PYTHON_RUN_DEPENDS=	${PYNUMPY}
 PYTHON_USES=		python
 PYTHON_CMAKE_BOOL=	PYTHON
 
 _MAJORVER=	3_1
 _VER=		29
 _MINVER=	8
 _PLVER=		0
 
 post-patch:
 	${REINPLACE_CMD} -E 's}find_package\(Python(3?) COMPONENTS}set(Python\1_EXECUTABLE ${PYTHON_CMD})\nfind_package(Python\1 ${PYTHON_VER} EXACT COMPONENTS}' \
 		${WRKSRC}/src/python/CMakeLists.txt
 
 post-install:
 .for l in libImath
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/${l}-${_MAJORVER}.so
 .endfor
 
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${PORTDOCS:S|^|${WRKSRC}/|} ${STAGEDIR}${DOCSDIR}
 
 do-test:
 	cd ${BUILD_WRKSRC} && ctest -j ${MAKE_JOBS_NUMBER}
 
 .include <bsd.port.mk>
diff --git a/math/Imath/distinfo b/math/Imath/distinfo
index f9da02d60398..03b6d9248989 100644
--- a/math/Imath/distinfo
+++ b/math/Imath/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1685734514
-SHA256 (AcademySoftwareFoundation-Imath-3.1.9-v3.1.9_GH0.tar.gz) = f1d8aacd46afed958babfced3190d2d3c8209b66da451f556abd6da94c165cf3
-SIZE (AcademySoftwareFoundation-Imath-3.1.9-v3.1.9_GH0.tar.gz) = 598497
+TIMESTAMP = 1685793190
+SHA256 (AcademySoftwareFoundation-Imath-v3.1.9_GH0.tar.gz) = f1d8aacd46afed958babfced3190d2d3c8209b66da451f556abd6da94c165cf3
+SIZE (AcademySoftwareFoundation-Imath-v3.1.9_GH0.tar.gz) = 598497