diff --git a/japicmp/src/main/java/japicmp/cmp/JarArchiveComparator.java b/japicmp/src/main/java/japicmp/cmp/JarArchiveComparator.java
index 341b8f56f..5fd55f2a6 100644
--- a/japicmp/src/main/java/japicmp/cmp/JarArchiveComparator.java
+++ b/japicmp/src/main/java/japicmp/cmp/JarArchiveComparator.java
@@ -296,7 +296,6 @@ public List<CtClass> filterClasses(List<CtClass> ctClasses, ReducibleClassPool c
 						LOGGER.fine(String.format("Adding class '%s' with jar name '%s' to list.", ctClass.getName(), ctClass.getName()));
 					}
 				} else {
-					classPool.remove(ctClass);
 					if (LOGGER.isLoggable(Level.FINE)) {
 						LOGGER.fine(String.format("Ignoring class '%s' with jar name '%s'.", ctClass.getName(), ctClass.getName()));
 					}