diff --git a/3rdparty/QtPropertyBrowser/src/CMakeLists.txt b/3rdparty/QtPropertyBrowser/src/CMakeLists.txt
index b55bfbce..83717cbe 100644
--- a/3rdparty/QtPropertyBrowser/src/CMakeLists.txt
+++ b/3rdparty/QtPropertyBrowser/src/CMakeLists.txt
@@ -39,7 +39,7 @@ add_library(${TARGET_NAME} STATIC
   ${_QRC_SRCS}
   )
 
-if (!MSVC)
+if (NOT MSVC)
   target_compile_options(${TARGET_NAME} PRIVATE -Wno-deprecated-declarations)
 endif()