diff --git a/base/src/main/java/de/staropensource/sosengine/base/utility/PlaceholderEngine.java b/base/src/main/java/de/staropensource/sosengine/base/utility/PlaceholderEngine.java
index 2c4fb643..72d71e20 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/utility/PlaceholderEngine.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/utility/PlaceholderEngine.java
@@ -20,10 +20,10 @@
 package de.staropensource.sosengine.base.utility;
 
 import de.staropensource.sosengine.base.classes.Placeholder;
+import de.staropensource.sosengine.base.classes.logging.LogIssuer;
 import de.staropensource.sosengine.base.data.placeholders.*;
 import de.staropensource.sosengine.base.logging.Logger;
 import de.staropensource.sosengine.base.types.CodePart;
-import de.staropensource.sosengine.base.classes.logging.LogIssuer;
 import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
 
@@ -153,4 +153,13 @@ public final class PlaceholderEngine {
     public String process(@NotNull String text) {
         return process(text, new ArrayList<>());
     }
+
+    /**
+     * Clears {@code instance}. Used in unit tests.
+     *
+     * @since 1-alpha1
+     */
+    private static void clearInstance() {
+        instance = null;
+    }
 }