diff --git a/sci-chemistry/avogadro2/avogadro2-1.103.0.ebuild b/sci-chemistry/avogadro2/avogadro2-1.103.0.ebuild
index 918490a468213..8169605e2f8e8 100644
--- a/sci-chemistry/avogadro2/avogadro2-1.103.0.ebuild
+++ b/sci-chemistry/avogadro2/avogadro2-1.103.0.ebuild
@@ -20,12 +20,12 @@ KEYWORDS="~amd64 ~x86"
 IUSE="doc rpc"
 
 RDEPEND="
+	dev-cpp/eigen:=
 	dev-qt/qtbase:6[concurrent,gui,network,opengl,ssl,widgets]
 	~sci-libs/avogadrolibs-${PV}[archive,qt6]
 "
 DEPEND="
 	${RDEPEND}
-	dev-cpp/eigen:3
 "
 BDEPEND="doc? ( app-text/doxygen )"
 
diff --git a/sci-chemistry/avogadro2/avogadro2-2.0.0.ebuild b/sci-chemistry/avogadro2/avogadro2-2.0.0.ebuild
index 918490a468213..8169605e2f8e8 100644
--- a/sci-chemistry/avogadro2/avogadro2-2.0.0.ebuild
+++ b/sci-chemistry/avogadro2/avogadro2-2.0.0.ebuild
@@ -20,12 +20,12 @@ KEYWORDS="~amd64 ~x86"
 IUSE="doc rpc"
 
 RDEPEND="
+	dev-cpp/eigen:=
 	dev-qt/qtbase:6[concurrent,gui,network,opengl,ssl,widgets]
 	~sci-libs/avogadrolibs-${PV}[archive,qt6]
 "
 DEPEND="
 	${RDEPEND}
-	dev-cpp/eigen:3
 "
 BDEPEND="doc? ( app-text/doxygen )"