diff --git a/plugin/src/main/java/org/gradle/testretry/internal/executer/framework/TestFrameworkStrategy.java b/plugin/src/main/java/org/gradle/testretry/internal/executer/framework/TestFrameworkStrategy.java
index 823008de..9ea69464 100644
--- a/plugin/src/main/java/org/gradle/testretry/internal/executer/framework/TestFrameworkStrategy.java
+++ b/plugin/src/main/java/org/gradle/testretry/internal/executer/framework/TestFrameworkStrategy.java
@@ -52,7 +52,11 @@ static TestFrameworkStrategy of(JvmTestExecutionSpec spec) {
     }
 
     static boolean isSpock2Used(JvmTestExecutionSpec spec) {
-        return isSpock2JarOnPath(spec.getClasspath()) || isSpock2JarOnPath(spec.getModulePath());
+        return isSpock2JarOnPath(spec.getClasspath()) || supportsJavaModules() && isSpock2JarOnPath(spec.getModulePath());
+    }
+
+    static boolean supportsJavaModules() {
+        return gradleVersionIsAtLeast("6.4");
     }
 
     static boolean isSpock2JarOnPath(Iterable<? extends File> path) {