diff --git a/CMakeLists.txt b/CMakeLists.txt
index beff6c3..31d5a13 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.0.2)
 
 project(Miraclecast)
 
diff --git a/demo/CMakeLists.txt b/demo/CMakeLists.txt
index eac2023..4deb642 100644
--- a/demo/CMakeLists.txt
+++ b/demo/CMakeLists.txt
@@ -17,10 +17,18 @@ find_library(READLINE REQUIRED)
 pkg_check_modules(GIO2 REQUIRED gio-2.0)
 pkg_check_modules(GDK3 REQUIRED gdk-3.0)
 
+execute_process(COMMAND ${VALAC} --version
+				OUTPUT_VARIABLE VALAC_VERSION
+				OUTPUT_STRIP_TRAILING_WHITESPACE)
+string(REPLACE "Vala " "" VALAC_VERSION "${VALAC_VERSION}")
+if(VALAC_VERSION VERSION_GREATER 0.34.0)
+	list(APPEND VALA_EXTRA_OPTIONS -D VALA_VERSION_NEWER_THEN_0_34)
+endif()
+
 execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --atleast-version 3.22 gdk-3.0
 				RESULT_VARIABLE GDK_VERSION_NEWER_THEN_3_22)
 if(NOT GDK_VERSION_NEWER_THEN_3_22)
-	set(VALA_EXTRA_OPTIONS -D GDK_VERSION_NEWER_THEN_3_22)
+	list(APPEND VALA_EXTRA_OPTIONS -D GDK_VERSION_NEWER_THEN_3_22)
 endif()
 
 set(RES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/res)
diff --git a/demo/wfdctl.vala b/demo/wfdctl.vala
index 86baeda..79e15ba 100644
--- a/demo/wfdctl.vala
+++ b/demo/wfdctl.vala
@@ -330,7 +330,7 @@ private class WfdCtl : GLib.Application
 		info("P2P group formed");
 	}
 
-#if GDK_VERSION_NEWER_THEN_3_22
+#if GDK_VERSION_NEWER_THEN_3_22 && VALA_VERSION_NEWER_THEN_0_34
 	private void get_monitor_geometry(out Gdk.Rectangle g) throws Error
 	{
 		Gdk.Monitor m;
@@ -441,7 +441,7 @@ private class WfdCtl : GLib.Application
 		}
 
 		int n_monitors;
-#if GDK_VERSION_NEWER_THEN_3_22
+#if GDK_VERSION_NEWER_THEN_3_22 && VALA_VERSION_NEWER_THEN_0_34
 		n_monitors = display.get_n_monitors();
 #else
 		n_monitors = display.get_default_screen().get_n_monitors();