diff --git a/pkgs/by-name/oc/ocenaudio/package.nix b/pkgs/by-name/oc/ocenaudio/package.nix
index 1fb3acf58ce7..98852f37c325 100644
--- a/pkgs/by-name/oc/ocenaudio/package.nix
+++ b/pkgs/by-name/oc/ocenaudio/package.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   version = "3.13.4";
 
   src = fetchurl {
-    url = "https://www.ocenaudio.com/downloads/index.php/ocenaudio_debian9_64.deb?version=${version}";
+    url = "https://www.ocenaudio.com/downloads/index.php/ocenaudio_debian9_64.deb?version=v${version}";
     hash = "sha256-vE+xwwkBXIksy+6oygLDsrT8mFfHYIGcb6+8KMZe0no=";
   };
 
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
     mv $out/usr/share $out/share
     rm -rf $out/usr
     substituteInPlace $out/share/applications/ocenaudio.desktop \
-      --replace "/opt/ocenaudio/bin/ocenaudio" "ocenaudio"
+      --replace-fail "/opt/ocenaudio/bin/ocenaudio" "ocenaudio"
     mkdir -p $out/share/licenses/ocenaudio
     mv $out/bin/ocenaudio_license.txt $out/share/licenses/ocenaudio/LICENSE