diff --git a/core/src/main/java/org/testcontainers/utility/ImageNameSubstitutor.java b/core/src/main/java/org/testcontainers/utility/ImageNameSubstitutor.java
index dae3f178230..3f491e4c9b3 100644
--- a/core/src/main/java/org/testcontainers/utility/ImageNameSubstitutor.java
+++ b/core/src/main/java/org/testcontainers/utility/ImageNameSubstitutor.java
@@ -33,7 +33,12 @@ public static synchronized ImageNameSubstitutor instance() {
                 ImageNameSubstitutor configuredInstance;
                 try {
                     configuredInstance =
-                        (ImageNameSubstitutor) Class.forName(configuredClassName).getConstructor().newInstance();
+                        (ImageNameSubstitutor) Thread
+                            .currentThread()
+                            .getContextClassLoader()
+                            .loadClass(configuredClassName)
+                            .getConstructor()
+                            .newInstance();
                 } catch (Exception e) {
                     throw new IllegalArgumentException(
                         "Configured Image Substitutor could not be loaded: " + configuredClassName,