diff --git a/cmd/rehash.go b/cmd/rehash.go
index 4843496..3128ecf 100644
--- a/cmd/rehash.go
+++ b/cmd/rehash.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/packwiz/packwiz/core"
 	"github.com/spf13/cobra"
+	"golang.org/x/exp/slices"
 )
 
 // rehashCmd represents the rehash command
@@ -36,6 +37,11 @@ var rehashCmd = &cobra.Command{
 			os.Exit(1)
 		}
 
+		if !slices.Contains([]string{"sha1", "sha512", "sha256"}, args[0]) {
+			fmt.Printf("Hash format '%s' is not supported\n", args[0])
+			os.Exit(1)
+		}
+
 		session, err := core.CreateDownloadSession(mods, []string{args[0]})
 		if err != nil {
 			fmt.Printf("Error retrieving external files: %v\n", err)