diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4bcdf44d9..f3955acfa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -302,7 +302,7 @@ else()
     tr_add_external_auto_library(EVENT2 libevent event
         BUILD_IN_SOURCE 1
         CONFIGURE_COMMAND "<SOURCE_DIR>/autogen.sh"
-                  COMMAND "<SOURCE_DIR>/configure" "--prefix=<INSTALL_DIR>" "--disable-shared" ${EVENT2_CONFIGURE_FLAGS})
+                  COMMAND "<SOURCE_DIR>/configure" "--prefix=<INSTALL_DIR>" "--disable-shared" "--disable-openssl" ${EVENT2_CONFIGURE_FLAGS})
 endif()
 
 tr_add_external_auto_library(NATPMP libnatpmp natpmp)