diff --git a/c-programming/sys/cpuid_vendor_id.mod.c b/c-programming/sys/cpuid_vendor_id.mod.c
index d601977..0b46f1a 100644
--- a/c-programming/sys/cpuid_vendor_id.mod.c
+++ b/c-programming/sys/cpuid_vendor_id.mod.c
@@ -20,6 +20,7 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #ifdef _WIN32
 # include <intrin.h> // __cpuid()
@@ -83,5 +84,5 @@ int main(void) {
 	fputs("CPU Vendor ID: '", stdout);
 	fwrite(vendor_string, sizeof(char), 12, stdout);
 	fputs("'\n", stdout);
-	return 0;
+	return EXIT_SUCCESS;
 }