diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ed630a..64b6a9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,7 +42,7 @@ if(MSVC)
     # Enforce multi-threading runtime lib.
     string(REGEX REPLACE "/M[DT]d?" "" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
     string(REGEX REPLACE "/M[DT]d?" "" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
-    string(REGEX REPLACE "/M[DT]d?" "" CMAKE_C_FLAGS_RELWITHDEBINFO "{$CMAKE_C_FLAGS_RELWITHDEBINFO}")
+    string(REGEX REPLACE "/M[DT]d?" "" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
     string(REGEX REPLACE "/M[DT]d?" "" CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}")
     set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /MTd")
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /MT")