diff --git a/modules/highgui/src/window_QT.cpp b/modules/highgui/src/window_QT.cpp
index 7f37e143a8..c89918ee26 100644
--- a/modules/highgui/src/window_QT.cpp
+++ b/modules/highgui/src/window_QT.cpp
@@ -464,6 +464,7 @@ 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 93d9e4f7aa..bbc6007852 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 414ed64755..b9efe35bb0 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 0878bff60b..29b1e41ed0 100644
--- a/modules/highgui/src/window_w32.cpp
+++ b/modules/highgui/src/window_w32.cpp
@@ -260,6 +260,8 @@ CV_IMPL int cvInitSystem( int, char** )
         wasInitialized = 1;
     }
 
+    setlocale(LC_NUMERIC,"C");
+
     return 0;
 }