diff --git a/include/wx/image.h b/include/wx/image.h
index 95fe4dfd3e..309a09f161 100644
--- a/include/wx/image.h
+++ b/include/wx/image.h
@@ -258,9 +258,9 @@ public:
     wxImage ResampleBicubic(int width, int height) const;
 
     // blur the image according to the specified pixel radius
-    wxImage Blur(int radius);
-    wxImage BlurHorizontal(int radius);
-    wxImage BlurVertical(int radius);
+    wxImage Blur(int radius) const;
+    wxImage BlurHorizontal(int radius) const;
+    wxImage BlurVertical(int radius) const;
 
     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 
diff --git a/src/common/image.cpp b/src/common/image.cpp
index 92bbdde513..30c9f8994c 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -743,7 +743,7 @@ wxImage wxImage::ResampleBicubic(int width, int height) const
 }
 
 // Blur in the horizontal direction
-wxImage wxImage::BlurHorizontal(int blurRadius)
+wxImage wxImage::BlurHorizontal(int blurRadius) const
 {
     wxImage ret_image;
     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
@@ -858,7 +858,7 @@ wxImage wxImage::BlurHorizontal(int blurRadius)
 }
 
 // Blur in the vertical direction
-wxImage wxImage::BlurVertical(int blurRadius)
+wxImage wxImage::BlurVertical(int blurRadius) const
 {
     wxImage ret_image;
     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
@@ -973,7 +973,7 @@ wxImage wxImage::BlurVertical(int blurRadius)
 }
 
 // The new blur function
-wxImage wxImage::Blur(int blurRadius)
+wxImage wxImage::Blur(int blurRadius) const
 {
     wxImage ret_image;
     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);