diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5004bee..ad62765 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,8 +100,9 @@ if (UNIX AND NOT MINGW)
                 DESTINATION yerbacon/${CMAKE_INSTALL_BINDIR})
     endif()
 elseif(MINGW OR MSVC)
-    set(CMAKE_INSTALL_PREFIX "C:\\progs\\${PROJECT_NAME}")
-    set(CPACK_PACKAGING_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}\\")
+    set(PREFIXDIR "progs\\${PROJECT_NAME}")
+    set(CMAKE_INSTALL_PREFIX "C:\\${PREFIXDIR}")
+    set(CPACK_PACKAGING_INSTALL_PREFIX "${PREFIXDIR}")
     set(CMAKE_EXE_LINKER_FLAGS "-static -static-libstdc++ ${CMAKE_EXE_LINKER_FLAGS}")
     set(CPACK_PACKAGE_FILE_NAME "${PNAME}_wpkg")
     set(CPACK_NSIS_MUI_ICON "${CMAKE_CURRENT_SOURCE_DIR}/resources/${PROJECT_NAME}.ico")