--- a/tests/run-tests
+++ b/tests/run-tests
@@ -104,14 +104,14 @@ run_one() {
     return $fail
 }
 
-# list of prerequisite programs 
+# list of prerequisite programs
 # stuff from coreutils (cat, rm, etc) are not tested
 prereqs="python merge diff grep unzip md5sum gunzip sed"
 missing=''
 for pre in $prereqs ; do
     if type $pre > /dev/null 2>&1 ; then
         : prereq exists
-    else 
+    else
         missing="$pre $missing"
     fi
 done