diff --git a/include/wx/graphics.h b/include/wx/graphics.h
index 392c13044c..f2edd54ca3 100644
--- a/include/wx/graphics.h
+++ b/include/wx/graphics.h
@@ -323,7 +323,7 @@ public:
     float GetPosition() const { return m_pos; }
     void SetPosition(float pos)
     {
-        wxASSERT_MSG( pos >= 0 && pos < 1, "invalid gradient stop position" );
+        wxASSERT_MSG( pos >= 0 && pos <= 1, "invalid gradient stop position" );
 
         m_pos = pos;
     }
diff --git a/src/common/graphcmn.cpp b/src/common/graphcmn.cpp
index b014460e0b..7ab4da0b5c 100644
--- a/src/common/graphcmn.cpp
+++ b/src/common/graphcmn.cpp
@@ -520,7 +520,7 @@ void wxGraphicsGradientStops::Add(const wxGraphicsGradientStop& stop)
     }
     else
     {
-        wxFAIL_MSG( "invalid gradient stop position >= 1" );
+        wxFAIL_MSG( "invalid gradient stop position > 1" );
     }
 }