diff --git a/lang/ruby21/Makefile b/lang/ruby21/Makefile
index fb340443744c..a15b6efae1e5 100644
--- a/lang/ruby21/Makefile
+++ b/lang/ruby21/Makefile
@@ -56,7 +56,7 @@ RDOC_DESC=		Build and install Rdoc indexes
 EDIT_DESC=		Which line editing lib to use
 LIBEDIT_DESC=		Use libedit
 READLINE_DESC=		Use libreadline
-CAPIDOCS_BUILD_DEPENDS=	doxygen>0:devel/doxygen \
+CAPIDOCS_BUILD_DEPENDS=	doxygen>1.8.12,2:devel/doxygen \
 			dot:graphics/graphviz
 CAPIDOCS_CONFIGURE_ENABLE=	install-capi
 GMP_CONFIGURE_WITH=	gmp
diff --git a/lang/ruby22/Makefile b/lang/ruby22/Makefile
index 7de9bf3c0e1c..3e3263cbeff1 100644
--- a/lang/ruby22/Makefile
+++ b/lang/ruby22/Makefile
@@ -57,7 +57,7 @@ RDOC_DESC=		Build and install Rdoc indexes
 EDIT_DESC=		Which line editing lib to use
 LIBEDIT_DESC=		Use libedit
 READLINE_DESC=		Use libreadline
-CAPIDOCS_BUILD_DEPENDS=	doxygen>0:devel/doxygen \
+CAPIDOCS_BUILD_DEPENDS=	doxygen>1.8.12,2:devel/doxygen \
 			dot:graphics/graphviz
 CAPIDOCS_CONFIGURE_ENABLE=	install-capi
 GMP_CONFIGURE_WITH=	gmp
diff --git a/lang/ruby23/Makefile b/lang/ruby23/Makefile
index 412babdf5925..4fb6590cfc52 100644
--- a/lang/ruby23/Makefile
+++ b/lang/ruby23/Makefile
@@ -55,7 +55,7 @@ RDOC_DESC=		Build and install Rdoc indexes
 EDIT_DESC=		Which line editing lib to use
 LIBEDIT_DESC=		Use libedit
 READLINE_DESC=		Use libreadline
-CAPIDOCS_BUILD_DEPENDS=	doxygen>0:devel/doxygen \
+CAPIDOCS_BUILD_DEPENDS=	doxygen>1.8.12,2:devel/doxygen \
 			dot:graphics/graphviz
 CAPIDOCS_CONFIGURE_ENABLE=	install-capi
 GMP_CONFIGURE_WITH=	gmp