diff --git a/archival/rpm2cpio.c b/archival/rpm2cpio.c
index 3442046..7a2e64b 100644
--- a/archival/rpm2cpio.c
+++ b/archival/rpm2cpio.c
@@ -49,6 +49,7 @@
 }
 
 /* No getopt required */
+int rpm2cpio_main(int argc, char **argv);
 int rpm2cpio_main(int argc, char **argv)
 {
 	struct rpm_lead lead;