diff --git a/id.c b/id.c
index 09253cc..00068a3 100644
--- a/id.c
+++ b/id.c
@@ -8,6 +8,8 @@
 #include <limits.h>
 #include "util.h"
 
+static void curproc(void);
+
 static void
 usage(void)
 {
@@ -16,6 +18,19 @@ usage(void)
 
 int
 main(int argc, char *argv[])
+{
+	ARGBEGIN {
+	default:
+		usage();
+	} ARGEND;
+
+	curproc();
+
+	return EXIT_SUCCESS;
+}
+
+static void
+curproc(void)
 {
 	struct passwd *pw;
 	struct group *gr;
@@ -24,11 +39,6 @@ main(int argc, char *argv[])
 	int ngroups;
 	int i;
 
-	ARGBEGIN {
-	default:
-		usage();
-	} ARGEND;
-
 	/* Print uid/euid info */
 	uid = getuid();
 	printf("uid=%u", uid);
@@ -67,5 +77,4 @@ main(int argc, char *argv[])
 		printf("(%s)", gr->gr_name);
 	}
 	putchar('\n');
-	return EXIT_SUCCESS;
 }