diff --git a/pflogsumm-1.1.5/pflogsumm.pl b/pflogsumm-1.1.5/pflogsumm.pl
index eb527d0..7e26206 100755
--- a/pflogsumm-1.1.5/pflogsumm.pl
+++ b/pflogsumm-1.1.5/pflogsumm.pl
@@ -503,7 +503,12 @@ $usageMsg =
 # Accept either "_"s or "-"s in --switches
 foreach (@ARGV) {
     last if($_ eq "--");
-    tr/_/-/ if(/^--\w/);
+    if (/^--\w/)
+    {
+        my @argspl = split("=", $_, 2);
+        $argspl[0] =~ tr/_/-/;
+        $_ = join("=", @argspl);
+    }
 }
 
 # Some pre-inits for convenience