diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94eb5444be..a14bec5669 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -586,7 +586,7 @@ function(CheckQuicSupportInOpenSSL)
       set(CMAKE_REQUIRED_INCLUDES   "${WolfSSL_INCLUDE_DIRS}")
       set(CMAKE_REQUIRED_LIBRARIES  "${WolfSSL_LIBRARIES}")
       if(HAVE_LIBZ)
-        list(APPEND CMAKE_REQUIRED_INCLUDES  "${ZLIB_INCLUDE_DIRS}")
+        list(APPEND CMAKE_REQUIRED_INCLUDES  "${ZLIB_INCLUDE_DIRS}")  # Public wolfSSL headers require zlib headers
         list(APPEND CMAKE_REQUIRED_LIBRARIES "${ZLIB_LIBRARIES}")
       endif()
       if(WIN32)
@@ -598,7 +598,6 @@ function(CheckQuicSupportInOpenSSL)
       set(CMAKE_REQUIRED_INCLUDES   "${OPENSSL_INCLUDE_DIR}")
       set(CMAKE_REQUIRED_LIBRARIES  "${OPENSSL_LIBRARIES}")
       if(HAVE_LIBZ)
-        list(APPEND CMAKE_REQUIRED_INCLUDES  "${ZLIB_INCLUDE_DIRS}")
         list(APPEND CMAKE_REQUIRED_LIBRARIES "${ZLIB_LIBRARIES}")
       endif()
       if(WIN32)