diff --git a/dev-scheme/guile-gi/guile-gi-0.3.1.ebuild b/dev-scheme/guile-gi/guile-gi-0.3.1.ebuild
index 6571ad72e2..2d70136d48 100644
--- a/dev-scheme/guile-gi/guile-gi-0.3.1.ebuild
+++ b/dev-scheme/guile-gi/guile-gi-0.3.1.ebuild
@@ -25,6 +25,7 @@ BDEPEND="
 DEPEND="
 	>=dev-scheme/guile-2.0.9
 	dev-libs/gobject-introspection
+	x11-libs/gtk+:3[introspection]
 "
 RDEPEND="${DEPEND}"
 
diff --git a/dev-scheme/guile-gi/guile-gi-9999.ebuild b/dev-scheme/guile-gi/guile-gi-9999.ebuild
index 6571ad72e2..2d70136d48 100644
--- a/dev-scheme/guile-gi/guile-gi-9999.ebuild
+++ b/dev-scheme/guile-gi/guile-gi-9999.ebuild
@@ -25,6 +25,7 @@ BDEPEND="
 DEPEND="
 	>=dev-scheme/guile-2.0.9
 	dev-libs/gobject-introspection
+	x11-libs/gtk+:3[introspection]
 "
 RDEPEND="${DEPEND}"