diff --git a/its/ruling/src/test/resources/expected/python-S4143.json b/its/ruling/src/test/resources/expected/python-S4143.json
index 95f431e2f4..8204c245c7 100644
--- a/its/ruling/src/test/resources/expected/python-S4143.json
+++ b/its/ruling/src/test/resources/expected/python-S4143.json
@@ -30,7 +30,4 @@
 'project:twisted-12.1.0/twisted/test/test_dirdbm.py':[
 26,
 ],
-'project:twisted-12.1.0/twisted/words/protocols/irc.py':[
-2910,
-],
 }
diff --git a/python-checks/src/main/java/org/sonar/python/checks/OverwrittenCollectionEntryCheck.java b/python-checks/src/main/java/org/sonar/python/checks/OverwrittenCollectionEntryCheck.java
index 7edbf805cb..00b772ab3f 100644
--- a/python-checks/src/main/java/org/sonar/python/checks/OverwrittenCollectionEntryCheck.java
+++ b/python-checks/src/main/java/org/sonar/python/checks/OverwrittenCollectionEntryCheck.java
@@ -106,7 +106,7 @@ private static CollectionWrite collectionWrite(AssignmentStatement assignment, E
     if (collection.is(Kind.SLICE_EXPR, Kind.SUBSCRIPTION)) {
       CollectionWrite nested = collectionWrite(assignment, collection);
       if (nested != null) {
-        return new CollectionWrite(nested.collectionKey.nest(key), nested.leftBracket, rBracket, assignment);
+        return new CollectionWrite(nested.collectionKey.nest(key), nested.leftBracket, rBracket, assignment, collection);
       }
     }
 
@@ -114,7 +114,7 @@ private static CollectionWrite collectionWrite(AssignmentStatement assignment, E
       Symbol symbol = ((HasSymbol) collection).symbol();
       if (symbol != null) {
         CollectionKey collectionKey = new CollectionKey(symbol, key);
-        return new CollectionWrite(collectionKey, lBracket, rBracket, assignment);
+        return new CollectionWrite(collectionKey, lBracket, rBracket, assignment, collection);
       }
     }
 
@@ -163,8 +163,7 @@ private static void reportOverwrites(SubscriptionContext ctx, Map<CollectionKey,
         CollectionWrite firstWrite = writes.get(0);
         CollectionWrite secondWrite = writes.get(1);
         AssignmentStatement assignment = secondWrite.assignment;
-        Expression lhs = lhs(assignment);
-        if (TreeUtils.hasDescendant(assignment.assignedValue(), t -> CheckUtils.areEquivalent(lhs, t))) {
+        if (TreeUtils.hasDescendant(assignment.assignedValue(), t -> CheckUtils.areEquivalent(firstWrite.collection, t))) {
           return;
         }
         String message = String.format(
@@ -192,12 +191,14 @@ private static class CollectionWrite {
     private final Token leftBracket;
     private final Token rightBracket;
     private final AssignmentStatement assignment;
+    private final Expression collection;
 
-    private CollectionWrite(CollectionKey collectionKey, Token leftBracket, Token rightBracket, AssignmentStatement assignment) {
+    private CollectionWrite(CollectionKey collectionKey, Token leftBracket, Token rightBracket, AssignmentStatement assignment, Expression collection) {
       this.collectionKey = collectionKey;
       this.leftBracket = leftBracket;
       this.rightBracket = rightBracket;
       this.assignment = assignment;
+      this.collection = collection;
     }
   }
 }
diff --git a/python-checks/src/test/resources/checks/overwrittenCollectionEntryCheck.py b/python-checks/src/test/resources/checks/overwrittenCollectionEntryCheck.py
index 01e652dbe9..bdb29bbd98 100644
--- a/python-checks/src/test/resources/checks/overwrittenCollectionEntryCheck.py
+++ b/python-checks/src/test/resources/checks/overwrittenCollectionEntryCheck.py
@@ -91,3 +91,13 @@ def non_trivial_collections(f, obj1, obj2):
 def valid_replacement(list1, foo, x):
     list1["foo"] = foo(x)
     list1["foo"] = list1["foo"].replace("a", "b")
+
+def used_collection(list1):
+    list1[1] = 42
+    list1[1] = foo(list1[1])
+
+    list1[2] = 42
+    list1[2] = foo(list1)
+
+    list[3] = 42
+    list[3] = list[1] # FN