diff --git a/main.c b/main.c
index 00555af..a554768 100644
--- a/main.c
+++ b/main.c
@@ -1,5 +1,6 @@
 // This is a tool created to start C projects like cargo new or smith for C++
 // Author: Antonio Souza
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -31,6 +32,12 @@ void cinit_put_str_color(const char *str, cinit_color_t color)
 
 #define CINIT_VERSION "0.1.0"
 
+bool validate_project_name(const char *project_name) {
+    const char *allowed_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-";
+    size_t len = strlen(project_name);
+    return ((len > 0) && (strspn(project_name, allowed_chars) == len));
+}
+
 int main_file(const char *project_name) {
   char main_path[256];
   snprintf(main_path, sizeof(main_path), "%s/src/main.c", project_name);
@@ -126,6 +133,11 @@ int main(int argc, char *argv[]) {
         return 1;
       }
 
+      if(!validate_project_name(argv[2])) {
+        cinit_put_str_color("Your project name should use alphanumeric (A-Z, a-z, 0-9), underscore (_) or hyphen (-) characters only \n", CINIT_COLOR_RED);
+        return 1;
+      }
+
       // creating dir
       int dir = mkdir(argv[2], 0755);
       if (dir != 0) {