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diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3fcde11..1acc0b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -128,7 +128,7 @@ if(MSVC)
# handle msvcrt setting being passed in CMAKE_C_FLAGS
if(CMAKE_C_FLAGS MATCHES "[/-]M[TD]d?")
# ensure CMAKE_MSVC_RUNTIME_LIBRARY is not already defined
- if(DEFINED CMAKE_MSVC_RUNTIME_LIBRARY)
+ if(NOT CMAKE_MSVC_RUNTIME_LIBRARY)
message(FATAL_ERROR "please set the runtime library via either CMAKE_C_FLAGS or CMAKE_MSVC_RUNTIME_LIBRARY, not both")
endif()
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