diff --git a/src/external/external.pro b/src/external/external.pro
index dd38186af..2f368fc81 100644
--- a/src/external/external.pro
+++ b/src/external/external.pro
@@ -1,5 +1,7 @@
 config += debug_and_release
 
+CONFIG += c++11
+
 TEMPLATE      = subdirs
 
 SUBDIRS	= 	muparser_v225/src \