diff --git a/lib/backports/3.2.0/enumerator/product.rb b/lib/backports/3.2.0/enumerator/product.rb
index 87337ab6..c6268242 100644
--- a/lib/backports/3.2.0/enumerator/product.rb
+++ b/lib/backports/3.2.0/enumerator/product.rb
@@ -56,7 +56,7 @@ def size
       @__enums.each do |enum|
         return nil unless enum.respond_to?(:size)
         size = enum.size
-        return size if size == nil || size == Float::INFINITY
+        return size if size == nil || size == Float::INFINITY || size == 0
         return nil unless size.is_a?(Integer)
         total_size *= size
       end