diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf63a172..a1e8e0f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,7 @@ include(CheckCXXCompilerFlag)
 # ----------------------------------------------------------------------------
 # add debug define in project
 # ----------------------------------------------------------------------------
-if(NOT $(CMAKE_BUILD_TYPE) MATCHES “Release”)
+if(NOT $(CMAKE_BUILD_TYPE) MATCHES "Release")
     option(RK_DEBUG "Enable run-time debug mode(debugging)" ON)
     if(RK_DEBUG)
         add_definitions(-DRK_DEBUG)