diff --git a/src/lib.zig b/src/lib.zig
index 6e7b6d3d6f2675d60aa7b3c754e1b0ae317c48ef..271d6e7203f25b75f68f0501eb722ff587a53638 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -127,7 +127,16 @@ fn do(writer: anytype, comptime value: astgen.Value, data: anytype, ctx: anytype
                         }
                     }
                 },
-                else => @compileError("pek: block: TODO " ++ @tagName(v.name)),
+                .ifnotequal => {
+                    comptime assertEqual(v.args.len, 2);
+                    const x = comptime search(data, v.args[0]);
+                    const y = comptime search(data, v.args[1]);
+                    if (x != y) {
+                        inline for (v.body) |val| {
+                            try do(writer, val, data, ctx, indent, flag1);
+                        }
+                    }
+                },
             }
         },
         else => unreachable,
diff --git a/src/main.zig b/src/main.zig
index 20f35eae419ab931cfdb48038ed03d8bcb4c8a1e..8f03c03235d7c3ba14a1cf83210578ee8d184e50 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -35,6 +35,10 @@ const example_document =
     \\        {#ifequal top_cities.len best_rating}
     \\        p("#3")
     \\        /ifequal/
+    \\
+    \\        {#ifnotequal favorite.color sky}
+    \\        p("#4")
+    \\        /ifnotequal/
     \\    )
     \\)
 ;
diff --git a/test.html b/test.html
index b58ac4c548999e6cae141681901bbd6e435262f8..cd1fe1373654fbc5ac827d2e869d36e6535d4565 100644
--- a/test.html
+++ b/test.html
@@ -25,5 +25,6 @@
         <p>#1</p>
         <p>#2</p>
         <p>#3</p>
+        <p>#4</p>
     </body>
 </html>