diff --git a/PBot/VERSION.pm b/PBot/VERSION.pm
index a8c5258c..7f8304dd 100644
--- a/PBot/VERSION.pm
+++ b/PBot/VERSION.pm
@@ -13,7 +13,7 @@ use warnings;
 # These are set automatically by the build/commit script
 use constant {
   BUILD_NAME     => "PBot",
-  BUILD_REVISION => 533,
+  BUILD_REVISION => 534,
   BUILD_DATE     => "2014-03-23",
 };
 
diff --git a/modules/math.pl b/modules/math.pl
index 82d9e7d2..29fa631e 100755
--- a/modules/math.pl
+++ b/modules/math.pl
@@ -23,7 +23,7 @@ if($arguments =~ m/([\$`\|{}"'#@=])/) {
 } else {
   while($arguments =~ /([a-zA-Z0-9]+)/g) {
     my $keyword = $1;
-    next if $keyword =~ m/^[0-9]$/;
+    next if $keyword =~ m/^[0-9]+$/;
     $invalid = $keyword and last if not grep { /^$keyword$/ } @valid_keywords;
   }
 }