diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf43cbe..736cf8d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -136,6 +136,7 @@ IF(WIN32)
   GET_CURRENT_YEAR(CURRENT_YEAR)
   MESSAGE("Year for copyright is " ${CURRENT_YEAR})
 
+  SET(prefix ${CMAKE_INSTALL_PREFIX})
   SET(RC_COMMENT "${PACKAGE_NAME} library")
   SET(RC_INTERNAL_NAME "${PACKAGE_NAME} ${WIN32_MODE}")
   SET(RC_ORIGINAL_NAME ${PACKAGE_NAME}.dll)