diff --git a/testing/scripts/diff-remove-mime-types b/testing/scripts/diff-remove-mime-types
index fb447a9989..b8cc3d1e6d 100755
--- a/testing/scripts/diff-remove-mime-types
+++ b/testing/scripts/diff-remove-mime-types
@@ -3,20 +3,27 @@
 # A diff canonifier that removes all MIME types because libmagic output
 # can differ between installations.
 
-BEGIN { FS="\t"; OFS="\t"; column = -1; }
+BEGIN { FS="\t"; OFS="\t"; type_col = -1; desc_col = -1 }
 
 /^#fields/ {
     for ( i = 2; i < NF; ++i )
+        {
         if ( $i == "mime_type" )
-            column = i-1;
+            type_col = i-1;
+        if ( $i == "mime_desc" )
+            desc_col = i-1;
+        }
 }
 
-column >= 0 {
-    if ( $column != "-" )
+function remove_mime (n) {
+    if ( n >= 0 && $n != "-" )
         # Mark that it's set, but ignore content.
-        $column = "+";
+        $n = "+"
 }
 
+remove_mime(type_col)
+remove_mime(desc_col)
+
 {
     print;
 }