diff --git a/plugins/Plugins.cmake b/plugins/Plugins.cmake
index 4871c1f0c..fe167ccb3 100644
--- a/plugins/Plugins.cmake
+++ b/plugins/Plugins.cmake
@@ -76,6 +76,7 @@ MACRO(DFHACK_PLUGIN)
   SET(PLUGIN_PROTOCPP)
   FOREACH(pbuf ${PLUGIN_PROTOBUFS})
     SET(PLUGIN_SOURCES ${PLUGIN_SOURCES} ${CMAKE_CURRENT_SOURCE_DIR}/proto/${pbuf}.pb.cc)
+    SET(PLUGIN_SOURCES ${PLUGIN_SOURCES} ${CMAKE_CURRENT_SOURCE_DIR}/proto/${pbuf}.proto)
     SET(PLUGIN_PROTOCPP ${PLUGIN_PROTOCPP} ${CMAKE_CURRENT_SOURCE_DIR}/proto/${pbuf}.pb.cc)
   ENDFOREACH()