diff --git a/CMakeLists.txt b/CMakeLists.txt
index bec81d4..44fd48a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.1)
 
-if (WIN32)
+if (WIN32 AND BUILD_SHARED_LIBS)
     set(Boost_USE_STATIC_LIBS OFF)
     # The auto-linking feature has problems with USE_STATIC_LIBS off, so we use
     # BOOST_ALL_NO_LIB to turn it off.