diff --git a/client/.project b/client/.project
index 0f558b5..698636a 100644
--- a/client/.project
+++ b/client/.project
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE xml>
 <projectDescription>
 	<name>client</name>
 	<comment></comment>
diff --git a/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java b/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java
index ed75f24..959e0dd 100644
--- a/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java
+++ b/client/src/main/java/envoy/client/data/commands/SystemCommandsMap.java
@@ -1,9 +1,8 @@
 package envoy.client.data.commands;
 
 import java.util.*;
-import java.util.function.Function;
-import java.util.logging.Level;
-import java.util.logging.Logger;
+import java.util.function.Consumer;
+import java.util.logging.*;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
@@ -198,13 +197,13 @@ public final class SystemCommandsMap {
 	 *               are present
 	 * @since Envoy Client v0.2-beta
 	 */
-	public void requestRecommendations(String input, Function<Set<String>, Void> action) {
+	public void requestRecommendations(String input, Consumer<Set<String>> action) {
 		final var partialCommand = getCommand(input);
 		// Get the expected commands
 		final var recommendations = recommendCommands(partialCommand);
 		if (recommendations.isEmpty()) return;
 		// Execute the given action
-		else action.apply(recommendations);
+		else action.accept(recommendations);
 	}
 
 	/**