diff --git a/R/build_binaries.R b/R/build_binaries.R
index be0bf07..9d68c4e 100644
--- a/R/build_binaries.R
+++ b/R/build_binaries.R
@@ -19,6 +19,16 @@ build_binary_package <- function(package_name, tag = NULL, codename = NULL,
   cli::cli_h2("Preparations ({.pkg {package_name}})")
   codename <- set_codename(codename)
 
+  if (is.null(platform)) {
+    platform <- switch(codename,
+      "jammy" = "ubuntu",
+      "noble" = "ubuntu",
+      "rhel9" = "redhat",
+      "rhel8" = "redhat",
+      "alpine" = "alpine"
+    )
+  }
+
   if (debug) {
     cli::cli_alert_warning("DEBUG: codename {codename}.")
   }