diff --git a/src/execution/execution_helpers.c b/src/execution/execution_helpers.c
index 5157290..4d1848a 100644
--- a/src/execution/execution_helpers.c
+++ b/src/execution/execution_helpers.c
@@ -125,6 +125,7 @@ static int try_builtin(char **argv, struct hash_map *vars);
 
 static int builtin_break(char **argv);
 static int builtin_continue(char **argv);
+static int builtin_unset(char **argv, struct hash_map *vars);
 
 static int exec_assignment(struct list *assignment_list, struct hash_map *vars)
 {
@@ -487,6 +488,23 @@ static int builtin_cd(char **argv, struct hash_map *vars)
     return 0;
 }
 
+static int builtin_unset(char **argv, struct hash_map *vars)
+{
+    if (!argv)
+        return 0;
+    for (int i = 1; argv[i]; i++)
+    {
+        const char *name = argv[i];
+        if (name == NULL || name[0] == '\0')
+            continue;
+        // remove from shell variables
+        hash_map_remove(vars, name);
+        // remove from environment variables
+        unsetenv(name);
+    }
+    return 0;
+}
+
 /**
  * @brief Tries to execute a builtin command if the command matches a builtin
  *
@@ -500,6 +518,8 @@ static int try_builtin(char **argv, struct hash_map *vars)
 
     if (strcmp(argv[0], "echo") == 0)
         return builtin_echo(argv);
+    if (strcmp(argv[0], "unset") == 0)
+        return builtin_unset(argv, vars);
     if (strcmp(argv[0], "true") == 0)
         return builtin_true(argv);
     if (strcmp(argv[0], "false") == 0)