diff --git a/collects/mrlib/matrix-snip.rkt b/collects/mrlib/matrix-snip.rkt
index 8949e23a..c383d568 100644
--- a/collects/mrlib/matrix-snip.rkt
+++ b/collects/mrlib/matrix-snip.rkt
@@ -43,7 +43,7 @@
           [(pair? M_0) M_0]
           [else
            (error 'visible% "expects matrix or rectangle, given: ~e" M_0)])])
-                  
+
     (define/public (get-M) (if M M R))
     
     ;; create a matrix from this instance 
diff --git a/collects/mrlib/private/image-core-bitmap.rkt b/collects/mrlib/private/image-core-bitmap.rkt
index 6a56a7f0..2ac019ae 100644
--- a/collects/mrlib/private/image-core-bitmap.rkt
+++ b/collects/mrlib/private/image-core-bitmap.rkt
@@ -24,20 +24,20 @@ instead of this scaling code, we use the dc<%>'s scaling code.
 (provide/contract [scale-bitmap
                    (-> bytes? natural-number/c natural-number/c (and/c real? (not/c negative?)) 
                        bytes?)])
- 
-                  
+
+
 ; bmbytes: a bytes which represents an image -- 
 ; its size is a multiple of 4, and each
 ; four consecutive bytes represent alpha,r,g,b.
 
-                  
+
 ; scale: given a bmbytes,
 ; return a new bmbytes scaled by k in each direction.
 ;
 ; TODO: this code is meant for scaling by (>= k 1);
 ; if (< k 1) then the result will ignore ~ (1-k) of the original's pixels.
 ; We should really do a proper averaging for that case.
-;                  
+;
 (define (scale-bitmap bmbytes w h k)
   (let* {[new-w (round/e (* w k))]
          [new-h (round/e (* h k))]
diff --git a/collects/mrlib/syntax-browser.rkt b/collects/mrlib/syntax-browser.rkt
index 3bff33b2..d6166102 100644
--- a/collects/mrlib/syntax-browser.rkt
+++ b/collects/mrlib/syntax-browser.rkt
@@ -161,7 +161,7 @@ needed to really make this work:
                                      (send output-text last-position))
                                     (hash-ref range-ht stx-object (λ () null))))))))
                 (pop!))])
-                  
+
         ;; reset `path' and `next-push' for use in pp hooks.
         (set! path '())
         (set! next-push 0)