diff --git a/pom.xml b/pom.xml
index 9fb5ad61e..373e5d718 100644
--- a/pom.xml
+++ b/pom.xml
@@ -41,7 +41,7 @@
                     </execution>
                 </executions>
                 <configuration>
-                    <jvmTarget>16</jvmTarget>
+                    <jvmTarget>14</jvmTarget>
                 </configuration>
             </plugin>
             <plugin>
@@ -73,8 +73,8 @@
                     </execution>
                 </executions>
                 <configuration>
-                    <source>16</source>
-                    <target>16</target>
+                    <source>14</source>
+                    <target>14</target>
                 </configuration>
             </plugin>
             <plugin>
@@ -194,8 +194,8 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <exec.mainClass>de.bixilon.minosoft.Minosoft</exec.mainClass>
-        <maven.compiler.source>16</maven.compiler.source>
-        <maven.compiler.target>16</maven.compiler.target>
+        <maven.compiler.source>14</maven.compiler.source>
+        <maven.compiler.target>14</maven.compiler.target>
         <javafx.version>17-ea+11</javafx.version>
         <kotlin.version>1.5.10</kotlin.version>
         <lwjgl.version>3.2.3</lwjgl.version>
diff --git a/src/main/java/de/bixilon/minosoft/util/Util.java b/src/main/java/de/bixilon/minosoft/util/Util.java
index 005bbb8fd..c7b695372 100644
--- a/src/main/java/de/bixilon/minosoft/util/Util.java
+++ b/src/main/java/de/bixilon/minosoft/util/Util.java
@@ -303,7 +303,7 @@ public final class Util {
     public static String mapToUrlQuery(Map<String, String> data) {
         StringBuilder builder = new StringBuilder();
         for (Map.Entry<String, String> entry : data.entrySet()) {
-            if (!builder.isEmpty()) {
+            if (builder.length() != 0) {
                 builder.append("&");
             }
             builder.append(URLEncoder.encode(entry.getKey(), StandardCharsets.UTF_8));