diff --git a/CMakeLists.txt b/CMakeLists.txt
index e196173..68fb24d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -198,7 +198,7 @@ target_link_libraries(TeaSpeak PUBLIC
         tommath::static
 )
 
-target_compile_options(TeaSpeak PRIVATE "-Wall")
+target_compile_options(TeaSpeak PRIVATE "-Wall -DHAVE_MYSQL_H")
 
 if (TEASPEAK_SERVER)
     target_link_libraries(TeaSpeak PUBLIC CXXTerminal::static)