diff --git a/Makefile b/Makefile
index 9c26d65f..08b4041f 100644
--- a/Makefile
+++ b/Makefile
@@ -873,7 +873,8 @@ docs/build-matrix.html: $(foreach 1,$(PKGS),$(PKG_MAKEFILES))
 	            $(eval $(PKG)_BUILD_ONLY := $(false)) \
 	            <td class="supported">&#x2713;</td>,            \
 	            <td class="unsupported">&#x2717;</td>)\n)       \
-	    $(if $(call set_is_member,$(PKG),$($(BUILD)_PKGS)),        \
+	    $(if $(and $(call set_is_member,$(PKG),$($(BUILD)_PKGS)), \
+	               $(value $(call LOOKUP_PKG_RULE,$(PKG),BUILD,$(BUILD)))), \
 	        $(eval $(PKG)_VIRTUAL := $(false))   \
 	        <td class="supported">&#x2713;</td>, \
 	        <td class="unsupported">&#x2717;</td>)\n \