diff --git a/helper.pl b/helper.pl
index bd32378..591ce18 100755
--- a/helper.pl
+++ b/helper.pl
@@ -55,6 +55,7 @@ sub check_source {
       push @{$troubles->{unwanted_strcmp}},  $lineno if $file =~ /^src\/.*\.c$/ && $l =~ /\bstrcmp\s*\(/;
       push @{$troubles->{unwanted_clock}},   $lineno if $file =~ /^src\/.*\.c$/ && $l =~ /\bclock\s*\(/;
       push @{$troubles->{unwanted_qsort}},   $lineno if $file =~ /^src\/.*\.c$/ && $l =~ /\bqsort\s*\(/;
+      push @{$troubles->{sizeof_no_brackets}}, $lineno if $file =~ /^src\/.*\.c$/ && $l =~ /\bsizeof\s*[^\(]/;
       if ($file =~ m|src/.*\.c$| &&
           $file !~ m|src/ciphers/.*\.c$| &&
           $file !~ m|src/hashes/.*\.c$| &&
diff --git a/src/ciphers/des.c b/src/ciphers/des.c
index cbb20e3..2866054 100644
--- a/src/ciphers/des.c
+++ b/src/ciphers/des.c
@@ -1383,7 +1383,7 @@ static void cookey(const ulong32 *raw1, ulong32 *keyout)
         *cook++ |= (*raw1 & 0x0000003fL);
     }
 
-    XMEMCPY(keyout, dough, sizeof dough);
+    XMEMCPY(keyout, dough, sizeof(dough));
 }
 
 #ifdef LTC_CLEAN_STACK