diff --git a/src/main.cpp b/src/main.cpp
index 4eec8b2..6ca3405 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -69,12 +69,21 @@ int main(int argc, char **argv) {
   auto var_info = symbol.find_global_var(dbg, var_name);
 
   if (!var_info) {
-    std::cerr << "Error: Variable '" << var_name << "' not found" << std::endl;
+    std::cerr << "Error: Variable '" << var_name << "' not found or is not a supported integer type" << std::endl;
+    std::cerr << "Supported types: int (32-bit), long (64-bit), and unsigned variants" << std::endl;
     dwarf_finish(dbg);
     close(fd);
     return 1;
   }
 
+  // Validate variable size (only 4 or 8 bytes)
+  if (var_info->size != 4 && var_info->size != 8) {
+    std::cerr << "Error: Variable '" << var_name << "' has unsupported size: " << var_info->size << " bytes" << std::endl;
+    std::cerr << "Supported sizes: 4 bytes (int) or 8 bytes (long)" << std::endl;
+    dwarf_finish(dbg);
+    close(fd);
+    return 1;
+  }
 
   // Close DWARF resources before forking
   dwarf_finish(dbg);
@@ -82,8 +91,8 @@ int main(int argc, char **argv) {
 
   // Start watching the variable
   Tracer tracer;
-  tracer.watch_variable(var_info->name, exec_path.string(), var_info->address,
-                        var_info->size, prog_args);
+  int exit_code = tracer.watch_variable(var_info->name, exec_path.string(), var_info->address,
+                                         var_info->size, prog_args);
 
-  return 0;
+  return exit_code;
 }