diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf4676f0..ca85a5bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -94,23 +94,26 @@ add_definitions(${CLANG_DEFINITIONS})
 
 # Boost ------------------------------------------------------------------------
 
+set(Boost_USE_MULTITHREAD ON)
+set(Boost_USE_STATIC_LIBS ON)
+set(Boost_USE_STATIC_RUNTIME OFF)
+set(BOOST_LIBRARYDIR $ENV{BOOST_159_DIR})
+
 if(UNIX AND NOT APPLE)
 	set(BOOST_ROOT $ENV{BOOST_DIR})
 elseif(UNIX AND APPLE)
 	set(BOOST_ROOT $ENV{BOOST_159_DIR})
 	set(Boost_NO_SYSTEM_PATHS ON)
 else()
+	STRING(REGEX REPLACE "\\\\" "/" BOOST_LIBRARYDIR ${BOOST_LIBRARYDIR})
+	
 	if(${WINXXBITS} STREQUAL "Win32")
-		set(BOOST_ROOT "$ENV{BOOST_159_DIR}/win32")
+		set(BOOST_ROOT "${BOOST_LIBRARYDIR}/win32")
 	else()
-		set(BOOST_ROOT "$ENV{BOOST_159_DIR}/win64")
+		set(BOOST_ROOT "${BOOST_LIBRARYDIR}/win64")
 	endif()
 	set(Boost_NO_SYSTEM_PATHS ON)
 endif()
-set(Boost_USE_MULTITHREAD ON)
-set(Boost_USE_STATIC_LIBS ON)
-set(Boost_USE_STATIC_RUNTIME OFF)
-set(BOOST_LIBRARYDIR $ENV{BOOST_159_DIR})
 
 find_package(Boost 1.59 COMPONENTS system program_options filesystem date_time REQUIRED)