diff --git a/putty.spec b/putty.spec
index bf6305e..92a164d 100644
--- a/putty.spec
+++ b/putty.spec
@@ -41,7 +41,7 @@ for the SSH, Telnet, rlogin, and raw TCP computing protocols and as a
 serial console client.
 
 %prep
-mv %_sourcedir/%name-%version.tar.gz.RSA %_sourcedir/%name-%version.tar.gz.sig
+cp %_sourcedir/%name-%version.tar.gz.RSA %_sourcedir/%name-%version.tar.gz.sig
 %{?gpg_verify: %gpg_verify %_sourcedir/%name-%version.tar.gz.sig}
 %setup -q
 %patch -P 3 -P 4 -p1