diff --git a/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java b/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java
index 9901bdb993..a557bd17eb 100644
--- a/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java
@@ -150,6 +150,9 @@ default ClassSourceLookup createClassSourceLookup() {
      * @return the class finder
      */
     default ClassFinder createClassFinder() {
+        if (Boolean.getBoolean("spark.disableInstrumentation")) {
+            return FallbackClassFinder.INSTANCE;
+        }
         return ClassFinder.combining(
                 new InstrumentationClassFinder(this),
                 FallbackClassFinder.INSTANCE