diff --git a/R/build_binaries.R b/R/build_binaries.R
index f739aea..2a39142 100644
--- a/R/build_binaries.R
+++ b/R/build_binaries.R
@@ -19,13 +19,14 @@ build_binary_package <- function(package_name, tag = NULL, codename = NULL,
   cli::cli_h2("Preparations ({.pkg {package_name}})")
   codename <- set_codename(codename)
 
+  # map the 'pak' platform names to the ones used in s3
   if (is.null(platform)) {
     platform <- switch(codename,
       "jammy" = "ubuntu-2204",
       "noble" = "ubuntu-2404",
       "rhel9" = "redhat-9",
       "rhel8" = "redhat-8",
-      "alpine" = "alpine-320"
+      "alpine320" = "alpine-320"
     )
   }