diff --git a/antigen.zsh b/antigen.zsh
index 35911ed..ff09da8 100644
--- a/antigen.zsh
+++ b/antigen.zsh
@@ -143,6 +143,10 @@ antigen-update () {
             # If there is no `*.plugin.zsh` file, source *all* the `*.zsh`
             # files.
             for script ($location/*.zsh) source "$script"
+        elif [[ ! -z "$(ls "$location" | grep -m1 '.sh$')" ]]; then
+            # If there are no `*.zsh` files either, we look for and source any
+            # `*.sh` files instead.
+            for script ($location/*.sh) source "$script"
         fi
 
         # Add to $fpath, for completion(s)