diff --git a/autogpt/commands/execute_code.py b/autogpt/commands/execute_code.py
index 20c5e1a27e79..8826e47829c0 100644
--- a/autogpt/commands/execute_code.py
+++ b/autogpt/commands/execute_code.py
@@ -109,7 +109,7 @@ def validate_command(command: str, config: Config) -> bool:
     if not tokens:
         return False
 
-    if config.deny_commands and tokens[0] not in config.deny_commands:
+    if config.deny_commands and tokens[0] in config.deny_commands:
         return False
 
     for keyword in config.allow_commands:
diff --git a/tests/integration/test_execute_code.py b/tests/integration/test_execute_code.py
index c75d66fa7b91..fa3cf2591b88 100644
--- a/tests/integration/test_execute_code.py
+++ b/tests/integration/test_execute_code.py
@@ -48,3 +48,11 @@ def test_execute_python_file_invalid(config):
 def test_execute_shell(config_allow_execute, random_string, config):
     result = sut.execute_shell(f"echo 'Hello {random_string}!'", config)
     assert f"Hello {random_string}!" in result
+
+
+def test_execute_shell_deny_command(
+    python_test_file: str, config_allow_execute: bool, config: Config
+):
+    config.deny_commands = ["echo"]
+    result = sut.execute_shell(f"echo 'Hello {random_string}!'", config)
+    assert "Error:" in result and "not allowed" in result