diff --git a/YACReader/YACReader.pro b/YACReader/YACReader.pro
index 3f751d17..b8827aa1 100644
--- a/YACReader/YACReader.pro
+++ b/YACReader/YACReader.pro
@@ -12,10 +12,6 @@ DEFINES += NOMINMAX YACREADER
 include (../config.pri)
 include (../dependencies/pdf_backend.pri)
 
-unix:!macx{
-    QMAKE_CXXFLAGS += -std=c++11
-}
-
 unix:haiku {
   DEFINES += _BSD_SOURCE
   LIBS    += -lnetwork -lbsd
diff --git a/YACReaderLibrary/YACReaderLibrary.pro b/YACReaderLibrary/YACReaderLibrary.pro
index 3910b5dc..31bc2c29 100644
--- a/YACReaderLibrary/YACReaderLibrary.pro
+++ b/YACReaderLibrary/YACReaderLibrary.pro
@@ -14,8 +14,6 @@ INCLUDEPATH += . \
 
 DEFINES += SERVER_RELEASE NOMINMAX YACREADER_LIBRARY
 
-CONFIG += c++11
-
 # load default build flags
 include (../config.pri)
 include (../dependencies/pdf_backend.pri)
diff --git a/YACReaderLibraryServer/YACReaderLibraryServer.pro b/YACReaderLibraryServer/YACReaderLibraryServer.pro
index 64f498be..78342492 100644
--- a/YACReaderLibraryServer/YACReaderLibraryServer.pro
+++ b/YACReaderLibraryServer/YACReaderLibraryServer.pro
@@ -28,10 +28,6 @@ macx {
   CONFIG += objective_c
 }
 
-unix {
-  CONFIG += c++11
-}
-
 unix:haiku {
   DEFINES += _BSD_SOURCE
   LIBS    += -lnetwork -lbsd
diff --git a/config.pri b/config.pri
index 44451cde..b89d5404 100644
--- a/config.pri
+++ b/config.pri
@@ -2,6 +2,8 @@
 # default values if they're not set on build time
 # for a more detailed description, see INSTALL.TXT
 
+CONFIG += c++11
+
 # check Qt version
 QT_VERSION = $$[QT_VERSION]
 QT_VERSION = $$split(QT_VERSION, ".")