diff --git a/interpreter/nodev8/v8.go b/interpreter/nodev8/v8.go
index 30959a4..96e9ee7 100644
--- a/interpreter/nodev8/v8.go
+++ b/interpreter/nodev8/v8.go
@@ -494,8 +494,8 @@ type v8Instance struct {
 
 	// mappings is indexed by the Mapping to its generation
 	mappings map[process.Mapping]uint32
-	// prefixes is indexed by the prefix added to ebpf maps (to be cleaned up) to its generation
-	prefixes map[lpm.Prefix]uint32
+	// prefixes is indexed by the prefix added to ebpf maps (to be cleaned up)
+	prefixes map[lpm.Prefix]struct{}
 	// mappingGeneration is the current generation (so old entries can be pruned)
 	mappingGeneration uint32
 }
@@ -573,30 +573,29 @@ func (i *v8Instance) SynchronizeMappings(ebpf interpreter.EbpfHandler,
 
 		for _, prefix := range prefixes {
 			if _, exists := i.prefixes[prefix]; exists {
-				i.prefixes[prefix] = i.mappingGeneration
 				continue
 			}
 			err := ebpf.UpdatePidInterpreterMapping(pid, prefix, support.ProgUnwindV8, 0, 0)
 			if err != nil {
 				return err
 			}
-			i.prefixes[prefix] = i.mappingGeneration
+			i.prefixes[prefix] = struct{}{}
 		}
 	}
 
-	// Remove prefixes not seen
-	for prefix, generation := range i.prefixes {
-		if generation == i.mappingGeneration {
-			continue
-		}
-		_ = ebpf.DeletePidInterpreterMapping(pid, prefix)
-		delete(i.prefixes, prefix)
-	}
 	for m, generation := range i.mappings {
 		if generation == i.mappingGeneration {
 			continue
 		}
 		log.Debugf("Disabling V8 for %#x/%#x", m.Vaddr, m.Length)
+		prefixes, err := lpm.CalculatePrefixList(m.Vaddr, m.Vaddr+m.Length)
+		if err != nil {
+			return fmt.Errorf("new anonymous mapping lpm failure %#x/%#x", m.Vaddr, m.Length)
+		}
+		for _, prefix := range prefixes {
+			_ = ebpf.DeletePidInterpreterMapping(pid, prefix)
+			delete(i.prefixes, prefix)
+		}
 		delete(i.mappings, m)
 	}
 
@@ -1820,7 +1819,7 @@ func (d *v8Data) Attach(ebpf interpreter.EbpfHandler, pid util.PID, _ libpf.Addr
 		d:            d,
 		rm:           rm,
 		mappings:     make(map[process.Mapping]uint32),
-		prefixes:     make(map[lpm.Prefix]uint32),
+		prefixes:     make(map[lpm.Prefix]struct{}),
 		addrToString: addrToString,
 		addrToCode:   addrToCode,
 		addrToSFI:    addrToSFI,