diff --git a/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/Protocolc0_30toc0_30cpe.java b/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/Protocolc0_30toc0_30cpe.java
index a3a98ee..2456601 100644
--- a/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/Protocolc0_30toc0_30cpe.java
+++ b/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/Protocolc0_30toc0_30cpe.java
@@ -316,7 +316,7 @@ public class Protocolc0_30toc0_30cpe extends AbstractProtocol<ClientboundPackets
                     final int blockId = wrapper.get(Type.BYTE, 0);
 
                     int block = level.getBlock(position);
-                    final boolean disallow = (placeBlock && !blockPermissions.isPlacingAllowed(blockId)) || (!placeBlock && !blockPermissions.isBreakingAllowed(block));
+                    final boolean disallow = (placeBlock && blockPermissions.isPlacingDenied(blockId)) || (!placeBlock && blockPermissions.isBreakingDenied(block));
 
                     if (disallow) {
                         wrapper.cancel();
diff --git a/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/storage/ExtBlockPermissionsStorage.java b/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/storage/ExtBlockPermissionsStorage.java
index 70b21f4..c961feb 100644
--- a/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/storage/ExtBlockPermissionsStorage.java
+++ b/src/main/java/net/raphimc/vialegacy/protocols/classic/protocolc0_28_30toc0_28_30cpe/storage/ExtBlockPermissionsStorage.java
@@ -24,35 +24,35 @@ import com.viaversion.viaversion.libs.fastutil.ints.IntSet;
 
 public class ExtBlockPermissionsStorage extends StoredObject {
 
-    private final IntSet placingAllowed = new IntOpenHashSet();
-    private final IntSet breakingAllowed = new IntOpenHashSet();
+    private final IntSet placingDenied = new IntOpenHashSet();
+    private final IntSet breakingDenied = new IntOpenHashSet();
 
     public ExtBlockPermissionsStorage(final UserConnection user) {
         super(user);
     }
 
     public void addPlaceable(final int block) {
-        this.placingAllowed.add(block);
+        this.placingDenied.remove(block);
     }
 
     public void addBreakable(final int block) {
-        this.breakingAllowed.add(block);
+        this.breakingDenied.remove(block);
     }
 
     public void removePlaceable(final int block) {
-        this.placingAllowed.remove(block);
+        this.placingDenied.add(block);
     }
 
     public void removeBreakable(final int block) {
-        this.breakingAllowed.remove(block);
+        this.breakingDenied.add(block);
     }
 
-    public boolean isPlacingAllowed(final int block) {
-        return this.placingAllowed.contains(block);
+    public boolean isPlacingDenied(final int block) {
+        return this.placingDenied.contains(block);
     }
 
-    public boolean isBreakingAllowed(final int block) {
-        return this.breakingAllowed.contains(block);
+    public boolean isBreakingDenied(final int block) {
+        return this.breakingDenied.contains(block);
     }
 
 }