diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ddc211b0..bd9b32575 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,7 +70,7 @@ if (WITH_PYTHON)
     find_package(Python3 COMPONENTS Interpreter Development)
 endif()
 
-if (MSVC)
+if (WIN32)
     # Use unsigned characters
     add_definitions(-J)
     # Make sure cmath header defines things like M_PI