diff --git a/modules/highgui/src/window_QT.cpp b/modules/highgui/src/window_QT.cpp
index 64ebf0870..1a3830319 100644
--- a/modules/highgui/src/window_QT.cpp
+++ b/modules/highgui/src/window_QT.cpp
@@ -447,6 +447,7 @@ static int icvInitSystem(int* c, char** v)
     if (!QApplication::instance())
     {
         new QApplication(*c, v);
+        setlocale(LC_NUMERIC,"C");
 
         qDebug() << "init done";
 
diff --git a/modules/highgui/src/window_carbon.cpp b/modules/highgui/src/window_carbon.cpp
index 3d092e736..e44093512 100644
--- a/modules/highgui/src/window_carbon.cpp
+++ b/modules/highgui/src/window_carbon.cpp
@@ -146,6 +146,7 @@ CV_IMPL int cvInitSystem( int argc, char** argv )
         }
         wasInitialized = 1;
     }
+    setlocale(LC_NUMERIC,"C");
 
     return 0;
 }
diff --git a/modules/highgui/src/window_cocoa.mm b/modules/highgui/src/window_cocoa.mm
index 433e437a7..74f6c0554 100644
--- a/modules/highgui/src/window_cocoa.mm
+++ b/modules/highgui/src/window_cocoa.mm
@@ -156,6 +156,8 @@ CV_IMPL int cvInitSystem( int , char** )
     //[application finishLaunching];
     //atexit(icvCocoaCleanup);
 
+    setlocale(LC_NUMERIC,"C");
+
     return 0;
 }
 
diff --git a/modules/highgui/src/window_w32.cpp b/modules/highgui/src/window_w32.cpp
index b5cbc5565..fb5b6b5e4 100644
--- a/modules/highgui/src/window_w32.cpp
+++ b/modules/highgui/src/window_w32.cpp
@@ -250,6 +250,7 @@ CV_IMPL int cvInitSystem( int, char** )
 
         wasInitialized = 1;
     }
+    setlocale(LC_NUMERIC,"C");
 
     return 0;
 }