diff --git a/tests/image/image.cpp b/tests/image/image.cpp
index 4e8ab69d0d..6622358146 100644
--- a/tests/image/image.cpp
+++ b/tests/image/image.cpp
@@ -1346,11 +1346,48 @@ void ImageTestCase::BMPFlippingAndRLECompression()
 }
 
 
+static bool
+CompareApprox(const wxImage& i1, const wxImage& i2)
+{
+    if ( i1.GetWidth() != i2.GetWidth() )
+        return false;
+
+    if ( i1.GetHeight() != i2.GetHeight() )
+        return false;
+
+    const unsigned char* p1 = i1.GetData();
+    const unsigned char* p2 = i2.GetData();
+    const int numBytes = i1.GetWidth()*i1.GetHeight()*3;
+    for ( int n = 0; n < numBytes; n++, p1++, p2++ )
+    {
+        switch ( *p1 - *p2 )
+        {
+            case -1:
+            case  0:
+            case +1:
+                // Accept up to one pixel difference, this happens because of
+                // different rounding behaviours in different compiler versions
+                // even under the same architecture, see the example in
+                // http://thread.gmane.org/gmane.comp.lib.wxwidgets.devel/151149/focus=151154
+                break;
+
+            default:
+                return false;
+        }
+    }
+
+    return true;
+}
+
 #define ASSERT_IMAGE_EQUAL_TO_FILE(image, file) \
     { \
         wxImage imageFromFile(file); \
         CPPUNIT_ASSERT_MESSAGE( "Failed to load " file, imageFromFile.IsOk() ); \
-        CPPUNIT_ASSERT_EQUAL( imageFromFile, image ); \
+        CPPUNIT_ASSERT_MESSAGE \
+        ( \
+            "Wrong scaled " + CppUnit::assertion_traits<wxImage>::toString(image), \
+            CompareApprox(imageFromFile, image) \
+        ); \
     }
 
 void ImageTestCase::ScaleCompare()