diff --git a/src/command/SimpleCommandMap.php b/src/command/SimpleCommandMap.php
index 5c33bf25a..07afecf6d 100644
--- a/src/command/SimpleCommandMap.php
+++ b/src/command/SimpleCommandMap.php
@@ -272,10 +272,11 @@ class SimpleCommandMap implements CommandMap{
 			}
 
 			//These registered commands have absolute priority
+			$lowerAlias = strtolower($alias);
 			if(count($targets) > 0){
-				$this->knownCommands[strtolower($alias)] = new FormattedCommandAlias(strtolower($alias), $targets);
+				$this->knownCommands[$lowerAlias] = new FormattedCommandAlias($lowerAlias, $targets);
 			}else{
-				unset($this->knownCommands[strtolower($alias)]);
+				unset($this->knownCommands[$lowerAlias]);
 			}
 
 		}
diff --git a/src/item/LegacyStringToItemParser.php b/src/item/LegacyStringToItemParser.php
index e05f4d031..3d69dd7ac 100644
--- a/src/item/LegacyStringToItemParser.php
+++ b/src/item/LegacyStringToItemParser.php
@@ -108,8 +108,9 @@ final class LegacyStringToItemParser{
 			throw new LegacyStringToItemParserException("Unable to parse \"" . $b[1] . "\" from \"" . $input . "\" as a valid meta value");
 		}
 
-		if(isset($this->map[strtolower($b[0])])){
-			$item = $this->itemFactory->get($this->map[strtolower($b[0])], $meta);
+		$id = strtolower($b[0]);
+		if(isset($this->map[$id])){
+			$item = $this->itemFactory->get($this->map[$id], $meta);
 		}else{
 			throw new LegacyStringToItemParserException("Unable to resolve \"" . $input . "\" to a valid item");
 		}