diff --git a/ext/puma_http11/extconf.rb b/ext/puma_http11/extconf.rb
index 98a72554..13442d85 100644
--- a/ext/puma_http11/extconf.rb
+++ b/ext/puma_http11/extconf.rb
@@ -5,7 +5,7 @@ dir_config("puma_http11")
 $defs.push "-Wno-deprecated-declarations"
 
 if %w'ssl ssleay32'.find {|ssl| have_library(ssl, 'SSL_CTX_new')} and
-  %w'crypto libeay32'.find {|crypto| have_library(ssl, 'BIO_read')}
+  %w'crypto libeay32'.find {|crypto| have_library(crypto, 'BIO_read')}
 
   create_makefile("puma/puma_http11")
 end