diff --git a/src/3rdparty/CMakeLists.txt b/src/3rdparty/CMakeLists.txt
index d546fd06e87..19e49c34442 100644
--- a/src/3rdparty/CMakeLists.txt
+++ b/src/3rdparty/CMakeLists.txt
@@ -1,8 +1,7 @@
-set(CMAKE_C_FLAGS "")
-set(CMAKE_CXX_FLAGS "")
-
+# TODO: Move submodules to dedicated directories for flag control
 IF(QT5 AND LMMS_BUILD_LINUX AND WANT_VST)
 	set(BUILD_SHARED_LIBS OFF)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated")
 	add_subdirectory(qt5-x11embed)
 ENDIF()
 
diff --git a/src/3rdparty/rpmalloc/CMakeLists.txt b/src/3rdparty/rpmalloc/CMakeLists.txt
index 23d1551c22b..da6e7223ebc 100644
--- a/src/3rdparty/rpmalloc/CMakeLists.txt
+++ b/src/3rdparty/rpmalloc/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(CMAKE_C_FLAGS "-std=c11")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11 -Wno-unused-variable")
 
 add_library(rpmalloc STATIC
 	rpmalloc/rpmalloc/rpmalloc.c