diff --git a/common/widgets/infobar.cpp b/common/widgets/infobar.cpp
index e74ae93ea4..fdd8514ab3 100644
--- a/common/widgets/infobar.cpp
+++ b/common/widgets/infobar.cpp
@@ -161,11 +161,21 @@ void WX_INFOBAR::Dismiss()
     m_updateLock = false;
 }
 
-
+#include <eda_base_frame.h>
 void WX_INFOBAR::onSize( wxSizeEvent& aEvent )
 {
     int barWidth = GetSize().GetWidth();
+
+    // Calculate the horizontal size: because the infobar is shown on top of the draw canvas
+    // it is adjusted to the canvas width.
+    // On Mac, the canvas is the parent
+    // On other OS the parent is EDA_BASE_FRAME thta contains the canvas
     int parentWidth = m_parent->GetClientSize().GetWidth();
+    EDA_BASE_FRAME* frame = dynamic_cast<EDA_BASE_FRAME*>( m_parent );
+
+    if( frame && frame->GetToolCanvas() )
+        parentWidth = frame->GetToolCanvas()->GetSize().GetWidth();
+
 
     if( barWidth != parentWidth )
         SetSize( parentWidth, GetSize().GetHeight() );