diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c96ab34..00ea0cb 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -85,7 +85,7 @@ endif(UNIX)
 target_include_directories(discord-rpc PRIVATE ${RAPIDJSON}/include)
 
 if (NOT ${ENABLE_IO_THREAD})
-    add_definitions(discord-rpc PUBLIC -DDISCORD_DISABLE_IO_THREAD)
+    target_compile_definitions(discord-rpc PUBLIC -DDISCORD_DISABLE_IO_THREAD)
 endif (NOT ${ENABLE_IO_THREAD})
 
 if (${BUILD_DYNAMIC_LIB})