diff --git a/pkgs/by-name/li/libsidplayfp/package.nix b/pkgs/by-name/li/libsidplayfp/package.nix
index 4d3bec4e0db7..dab256cfe4ad 100644
--- a/pkgs/by-name/li/libsidplayfp/package.nix
+++ b/pkgs/by-name/li/libsidplayfp/package.nix
@@ -93,7 +93,7 @@ stdenv.mkDerivation (finalAttrs: {
     tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
     updateScript = gitUpdater {
       rev-prefix = "v";
-      ignoredVersions = "(a|rc)";
+      ignoredVersions = "[a-zA-Z]";
     };
   };
 
diff --git a/pkgs/by-name/si/sidplayfp/package.nix b/pkgs/by-name/si/sidplayfp/package.nix
index ee3921edd4fb..391414fec8b8 100644
--- a/pkgs/by-name/si/sidplayfp/package.nix
+++ b/pkgs/by-name/si/sidplayfp/package.nix
@@ -72,7 +72,7 @@ stdenv.mkDerivation (finalAttrs: {
     };
     updateScript = gitUpdater {
       rev-prefix = "v";
-      ignoredVersions = "(a|rc)";
+      ignoredVersions = "[a-zA-Z]";
     };
   };