diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b5eee7c8..5f6393908 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1170,7 +1170,7 @@ endif()
 
 if(GTK3_FOUND AND GTK3_gtksourceview_FOUND)
 	add_executable(mape ${MAPE_BASE_SOURCES} ${MAPE_SOURCES})
-	set_property(TARGET mape APPEND PROPERTY COMPILE_FLAGS ${GTK3_COMPILE_DEFINITIONS})
+	target_compile_options(mape PRIVATE ${GTK3_COMPILE_DEFINITIONS} ${GTK3_gtksourceview_COMPILE_DEFINITIONS})
 	target_include_directories(mape PRIVATE ${GTK3_INCLUDE_DIRS} ${GTK3_gtksourceview_INCLUDE_DIRS})
 	target_link_libraries(mape
 		${GTK3_LIBRARIES}