diff --git a/cm256cc/cm256cc.pro b/cm256cc/cm256cc.pro
index 6b7aeceb1..67c59ca7a 100644
--- a/cm256cc/cm256cc.pro
+++ b/cm256cc/cm256cc.pro
@@ -9,6 +9,8 @@ QT += core
 TEMPLATE = lib
 TARGET = cm256cc
 
+CONFIG(MSVC):DEFINES += cm256cc_EXPORTS
+
 CONFIG(MINGW32):LIBCM256CCSRC = "C:\softs\cm256cc"
 CONFIG(MINGW64):LIBCM256CCSRC = "C:\softs\cm256cc"
 CONFIG(MSVC):LIBCM256CCSRC = "C:\softs\cm256cc"
@@ -27,4 +29,5 @@ SOURCES = $$LIBCM256CCSRC/gf256.cpp\
 $$LIBCM256CCSRC/cm256.cpp
 
 HEADERS = $$LIBCM256CCSRC/gf256.h\
-$$LIBCM256CCSRC/cm256.h
+$$LIBCM256CCSRC/cm256.h\
+$$LIBCM256CCSRC/export.h