diff --git a/plugins/Plugins.cmake b/plugins/Plugins.cmake
index b97db055d..bf1ebd88b 100644
--- a/plugins/Plugins.cmake
+++ b/plugins/Plugins.cmake
@@ -6,6 +6,11 @@ IF(UNIX)
   IF(DFHACK_BUILD_64)
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64 -mno-avx")
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m64 -mno-avx")
+    IF(NOT APPLE)
+      # Linux: Check for unresolved symbols at link time
+      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wl,-z,defs")
+      SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wl,-z,defs")
+    ENDIF()
   ELSE()
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")