diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6a11e67..a1cddf8b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -176,8 +176,8 @@ if (USE_TLS)
     endif()
     message(STATUS "OpenSSL: " ${OPENSSL_VERSION})
 
-    target_compile_definitions(ixwebsocket PUBLIC ${OPENSSL_DEFINITIONS})
-    target_include_directories(${OPENSSL_INCLUDE_DIR})
+    add_definitions(${OPENSSL_DEFINITIONS})
+    target_include_directories(ixwebsocket PUBLIC ${OPENSSL_INCLUDE_DIR})
     target_link_libraries(ixwebsocket ${OPENSSL_LIBRARIES})
   elseif (USE_MBED_TLS)
     message(STATUS "TLS configured to use mbedtls")