diff --git a/coders/tiff.c b/coders/tiff.c
index 6b41d75c9..fc163690d 100644
--- a/coders/tiff.c
+++ b/coders/tiff.c
@@ -1622,18 +1622,19 @@ static Image *ReadTIFFImage(const ImageInfo *image_info,
         else
           for (i=0; i < extra_samples; i++)
           {
+            image->matte=MagickTrue;
             if (sample_info[i] == EXTRASAMPLE_ASSOCALPHA)
               {
-                image->matte=MagickTrue;
                 SetQuantumAlphaType(quantum_info,AssociatedQuantumAlpha);
                 (void) SetImageProperty(image,"tiff:alpha","associated");
+                break;
               }
             else
               if (sample_info[i] == EXTRASAMPLE_UNASSALPHA)
                 {
-                  image->matte=MagickTrue;
                   SetQuantumAlphaType(quantum_info,DisassociatedQuantumAlpha);
                   (void) SetImageProperty(image,"tiff:alpha","unassociated");
+                  break;
                 }
           }
         if (image->matte != MagickFalse)