diff --git a/lib/customerio/param_encoder.rb b/lib/customerio/param_encoder.rb
index 408c5c5..f45e5d5 100644
--- a/lib/customerio/param_encoder.rb
+++ b/lib/customerio/param_encoder.rb
@@ -55,7 +55,7 @@ def self.normalize_param(key, value)
       param
     end
 
-    # Prefer ERB::Util.url_encode, fall baack to deprecation URI.encode for
+    # Prefer ERB::Util.url_encode, fall back to deprecation URI.encode for
     # old Ruby support
     def self.escape_value(value)
       if ERB::Util.respond_to? :url_encode