diff --git a/ext/nokogiri/extconf.rb b/ext/nokogiri/extconf.rb
index 557d05261e..72d2c4ae2c 100644
--- a/ext/nokogiri/extconf.rb
+++ b/ext/nokogiri/extconf.rb
@@ -127,6 +127,9 @@ def process_recipe(name, version)
 if windows_p
   message "Cross-building nokogiri.\n"
 
+  dir_config('iconv')
+  have_iconv? or asplode 'iconv'
+
   HEADER_DIRS = [INCLUDEDIR]
   LIB_DIRS = [LIBDIR]
   XML2_HEADER_DIRS = [File.join(INCLUDEDIR, "libxml2"), INCLUDEDIR]