diff --git a/lib/3rdparty/mingw/CMakeLists.txt b/lib/3rdparty/mingw/CMakeLists.txt
index 8390d6ccffc..8157a509a6c 100644
--- a/lib/3rdparty/mingw/CMakeLists.txt
+++ b/lib/3rdparty/mingw/CMakeLists.txt
@@ -55,6 +55,7 @@ add_library(mingw_wmain crt0_w.c crtexe.c dllargv.c)
 set_property(TARGET mingw_wmain PROPERTY COMPILE_DEFINITIONS WPRFLAG UNICODE _UNICODE)
 add_dependencies(mingw_wmain psdk)
 
+add_definitions(-DCRTDLL)
 add_library(mingw_dllmain crtdll.c dllargv.c)
 add_dependencies(mingw_dllmain psdk)
 
@@ -69,4 +70,4 @@ add_custom_target(oldnames ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/liboldnames.a
 
 add_library(getopt getopt.c)
 set_property(TARGET getopt PROPERTY COMPILE_DEFINITIONS _DLL __USE_CRTIMP)
-add_dependencies(getopt psdk)
\ No newline at end of file
+add_dependencies(getopt psdk)