diff --git a/configure b/configure
index f94085f9d3..a7a6f3b059 100755
--- a/configure
+++ b/configure
@@ -226,7 +226,7 @@ while [ $# -ne 0 ]; do
             append_cache_entry DISABLE_RUBY_BINDINGS     BOOL   false
             ;;
         --with-openssl=*)
-            append_cache_entry OpenSSL_ROOT_DIR PATH $optarg
+            append_cache_entry OPENSSL_ROOT_DIR PATH $optarg
             ;;
         --with-bind=*)
             append_cache_entry BIND_ROOT_DIR PATH $optarg