diff --git a/dev-cpp/mastodonpp/mastodonpp-0.5.5.ebuild b/dev-cpp/mastodonpp/mastodonpp-0.5.5.ebuild
index 0a16f29..b21cfee 100644
--- a/dev-cpp/mastodonpp/mastodonpp-0.5.5.ebuild
+++ b/dev-cpp/mastodonpp/mastodonpp-0.5.5.ebuild
@@ -27,7 +27,7 @@ IUSE="doc examples test"
 RDEPEND=">=net-misc/curl-7.56.0[ssl]"
 DEPEND="${RDEPEND}
 	>=dev-util/cmake-3.9"
-BDEPEND="doc? ( app-doc/doxygen )
+BDEPEND="doc? ( app-doc/doxygen[dot] )
 	test? ( dev-cpp/catch )"
 
 RESTRICT="!test? ( test )"
diff --git a/dev-cpp/mastodonpp/mastodonpp-0.5.7.ebuild b/dev-cpp/mastodonpp/mastodonpp-0.5.7.ebuild
index eaab7d2..5677af1 100644
--- a/dev-cpp/mastodonpp/mastodonpp-0.5.7.ebuild
+++ b/dev-cpp/mastodonpp/mastodonpp-0.5.7.ebuild
@@ -28,7 +28,7 @@ DEPEND="
 	>=dev-util/cmake-3.9
 "
 BDEPEND="
-	doc? ( app-doc/doxygen )
+	doc? ( app-doc/doxygen[dot] )
 	test? ( dev-cpp/catch )
 "
 
diff --git a/dev-cpp/mastodonpp/mastodonpp-9999.ebuild b/dev-cpp/mastodonpp/mastodonpp-9999.ebuild
index eaab7d2..5677af1 100644
--- a/dev-cpp/mastodonpp/mastodonpp-9999.ebuild
+++ b/dev-cpp/mastodonpp/mastodonpp-9999.ebuild
@@ -28,7 +28,7 @@ DEPEND="
 	>=dev-util/cmake-3.9
 "
 BDEPEND="
-	doc? ( app-doc/doxygen )
+	doc? ( app-doc/doxygen[dot] )
 	test? ( dev-cpp/catch )
 "