diff --git a/src/frontend/qt_sdl/CMakeLists.txt b/src/frontend/qt_sdl/CMakeLists.txt
index 54dc3427..b3867134 100644
--- a/src/frontend/qt_sdl/CMakeLists.txt
+++ b/src/frontend/qt_sdl/CMakeLists.txt
@@ -86,7 +86,7 @@ else()
 endif()
 
 if (ENABLE_LIBSLIRP)
-	target_compile_definitions(melonDS PRIVATE -DHAVE_LIBSLIRP)
+    target_compile_definitions(melonDS PRIVATE -DHAVE_LIBSLIRP)
     target_sources(melonDS PRIVATE LAN_Socket.cpp)
 endif()