diff --git a/CMakeLists.txt b/CMakeLists.txt
index 58a95d0..deebaab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -121,6 +121,10 @@ target_compile_options(norm PUBLIC ${PLATFORM_FLAGS})
 target_include_directories(norm PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 target_include_directories(norm PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:include>)
 
+if(BUILD_SHARED_LIBS AND WIN32)
+	target_compile_definitions(norm PUBLIC NORM_USE_DLL)
+endif()
+
 # Install target
 install( TARGETS norm protokit EXPORT normTargets
         RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}