diff --git a/src/builtins/builtin_history.c b/src/builtins/builtin_history.c
index 9efb458..ddb27b7 100644
--- a/src/builtins/builtin_history.c
+++ b/src/builtins/builtin_history.c
@@ -62,7 +62,7 @@ char *his_last_command(char *line,
     char *new_str = NULL;
 
     if (his_command->sz == 0){
-        printf("%d: Event not found\n", his_command->sz);
+        fprintf(stderr, "%d: Event not found.\n", his_command->sz);
         return NULL;
     }
     new_line = concat_cmd_arg(his_command[his_command->sz - 1].command,
@@ -80,7 +80,7 @@ char *his_last_same_command(char *line,
 
     for (int i = his_command->sz - 1; i > 0; i--) {
         if (his_command[i].command == NULL) {
-            printf("%s: Event not found\n", new_line);
+            fprintf(stderr, "%s: Event not found.\n", new_line);
             return new_str;
         }
         if (strncmp(his_command[i].command, new_line, strlen(new_line)) == 0) {
@@ -91,7 +91,7 @@ char *his_last_same_command(char *line,
             return new_str;
         }
     }
-    printf("%s: Event not found\n", new_line);
+    fprintf(stderr, "%s: Event not found.\n", new_line);
     return new_str;
 }
 
@@ -103,7 +103,7 @@ char *his_id_command(char *line,
     char *new_str = NULL;
 
     if (id < 0 || id > 100 || his_command[id].command == NULL){
-        printf("%d: Event not found\n", id + 1);
+        fprintf(stderr, "%d: Event not found.\n", id + 1);
         return new_str;
     }
     new_line = concat_cmd_arg(his_command[id].command, his_command[id].arg);
diff --git a/validation_tests.py b/validation_tests.py
index d388660..0c3648d 100644
--- a/validation_tests.py
+++ b/validation_tests.py
@@ -172,4 +172,14 @@ TESTS = [
         ],
         depends_on=("PIPE", "REDIR", "SEMICOLON",)
     ),
+
+    Test(
+        key="ALIAS",
+        name="alias",
+        cmds=[
+            "ll\nalias ll ls\nll\n",
+            "ll\n",
+        ],
+        depends_on=()
+    ),
 ]