diff --git a/core/src/avm2/activation.rs b/core/src/avm2/activation.rs
index 4134b54f9..80a003679 100644
--- a/core/src/avm2/activation.rs
+++ b/core/src/avm2/activation.rs
@@ -480,6 +480,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
                 Op::IfStrictEq { offset } => self.op_if_strict_eq(offset, reader),
                 Op::IfStrictNe { offset } => self.op_if_strict_ne(offset, reader),
                 Op::StrictEquals => self.op_strict_equals(),
+                Op::Not => self.op_not(),
                 Op::HasNext => self.op_has_next(),
                 Op::HasNext2 {
                     object_register,
@@ -1383,6 +1384,14 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         Ok(FrameControl::Continue)
     }
 
+    fn op_not(&mut self) -> Result<FrameControl<'gc>, Error> {
+        let value = self.avm2.pop().coerce_to_boolean();
+
+        self.avm2.push(!value);
+
+        Ok(FrameControl::Continue)
+    }
+
     fn op_has_next(&mut self) -> Result<FrameControl<'gc>, Error> {
         //TODO: After adding ints, change this to ints.
         let cur_index = self.context.avm2.pop().as_number()?;
diff --git a/core/tests/regression_tests.rs b/core/tests/regression_tests.rs
index 9966572c4..b60025d0e 100644
--- a/core/tests/regression_tests.rs
+++ b/core/tests/regression_tests.rs
@@ -275,6 +275,7 @@ swf_tests! {
     (as3_instanceof, "avm2/instanceof", 1),
     (as3_truthiness, "avm2/truthiness", 1),
     (as3_falsiness, "avm2/falsiness", 1),
+    (as3_boolean_negation, "avm2/boolean_negation", 1),
 }
 
 // TODO: These tests have some inaccuracies currently, so we use approx_eq to test that numeric values are close enough.
diff --git a/core/tests/swfs/avm2/boolean_negation/Test.as b/core/tests/swfs/avm2/boolean_negation/Test.as
new file mode 100644
index 000000000..898da3b89
--- /dev/null
+++ b/core/tests/swfs/avm2/boolean_negation/Test.as
@@ -0,0 +1,61 @@
+package {
+	public class Test {
+	}
+}
+
+function assert_bool_not(val) {
+	var notval = !val;
+	
+	if (notval === true) {
+		trace("Inverse is true");
+	} else if (notval === false) {
+		trace("Inverse is false");
+	} else {
+		trace("TEST FAIL: Inverse is nonboolean");
+	}
+}
+
+trace("//!true");
+assert_bool_not(true);
+
+trace("//!false");
+assert_bool_not(false);
+
+trace("//!null");
+assert_bool_not(null);
+
+trace("//!undefined");
+assert_bool_not(undefined);
+
+trace("//!\"\"");
+assert_bool_not("");
+
+trace("//!\"str\"");
+assert_bool_not("str");
+
+trace("//!\"true\"");
+assert_bool_not("true");
+
+trace("//!\"false\"");
+assert_bool_not("false");
+
+trace("//!0.0");
+assert_bool_not(0.0);
+
+trace("//!NaN");
+assert_bool_not(NaN);
+
+trace("//!-0.0");
+assert_bool_not(-0.0);
+
+trace("//!Infinity");
+assert_bool_not(Infinity);
+
+trace("//!1.0");
+assert_bool_not(1.0);
+
+trace("//!-1.0");
+assert_bool_not(-1.0);
+
+trace("//!new Object()");
+assert_bool_not({});
\ No newline at end of file
diff --git a/core/tests/swfs/avm2/boolean_negation/output.txt b/core/tests/swfs/avm2/boolean_negation/output.txt
new file mode 100644
index 000000000..b84b7acc2
--- /dev/null
+++ b/core/tests/swfs/avm2/boolean_negation/output.txt
@@ -0,0 +1,30 @@
+//!true
+Inverse is false
+//!false
+Inverse is true
+//!null
+Inverse is true
+//!undefined
+Inverse is true
+//!""
+Inverse is true
+//!"str"
+Inverse is false
+//!"true"
+Inverse is false
+//!"false"
+Inverse is false
+//!0.0
+Inverse is true
+//!NaN
+Inverse is true
+//!-0.0
+Inverse is true
+//!Infinity
+Inverse is false
+//!1.0
+Inverse is false
+//!-1.0
+Inverse is false
+//!new Object()
+Inverse is false
diff --git a/core/tests/swfs/avm2/boolean_negation/test.fla b/core/tests/swfs/avm2/boolean_negation/test.fla
new file mode 100644
index 000000000..c41c9f293
Binary files /dev/null and b/core/tests/swfs/avm2/boolean_negation/test.fla differ
diff --git a/core/tests/swfs/avm2/boolean_negation/test.swf b/core/tests/swfs/avm2/boolean_negation/test.swf
new file mode 100644
index 000000000..650e155bb
Binary files /dev/null and b/core/tests/swfs/avm2/boolean_negation/test.swf differ