diff --git a/devel/hs-threadscope/Makefile b/devel/hs-threadscope/Makefile
index 787cd0b5a31e..eb2cd5c6818a 100644
--- a/devel/hs-threadscope/Makefile
+++ b/devel/hs-threadscope/Makefile
@@ -9,6 +9,7 @@ WWW=		https://www.haskell.org/haskellwiki/ThreadScope
 
 LICENSE=	BSD3CLAUSE
 
+BUILD_DEPENDS=	ghc-9.2.7:lang/ghc92
 LIB_DEPENDS=	libfontconfig.so:x11-fonts/fontconfig \
 		libfreetype.so:print/freetype2