diff --git a/plugins/spectate/CMakeLists.txt b/plugins/spectate/CMakeLists.txt
index 5ba1ed9cf..15e5cb172 100644
--- a/plugins/spectate/CMakeLists.txt
+++ b/plugins/spectate/CMakeLists.txt
@@ -1,8 +1,11 @@
 
 project(spectate)
 
+set_source_files_properties(pause.h PROPERTIES HEADER_FILE_ONLY TRUE)
+
 SET(SOURCES
         spectate.cpp
+        pause.h
         pause.cpp)
 
 dfhack_plugin(${PROJECT_NAME} ${SOURCES} LINK_LIBRARIES lua)