diff --git a/CMakeLists.txt b/CMakeLists.txt
index b7ecfaa415..33693fe33f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -265,7 +265,7 @@ endif()
 
 option(ENABLE_DEBUG "Enable curl debug features (for developing curl itself)" OFF)
 if(ENABLE_DEBUG)
-  message(WARNING "This curl build is Debug-enabled, do not use in production.")
+  message(WARNING "This curl build is Debug-enabled and insecure, do not use in production.")
 endif()
 option(ENABLE_CURLDEBUG "Enable TrackMemory debug feature" ${ENABLE_DEBUG})