diff --git a/gtsam/CMakeLists.txt b/gtsam/CMakeLists.txt
index 6a3d08eb8..4d1007d19 100644
--- a/gtsam/CMakeLists.txt
+++ b/gtsam/CMakeLists.txt
@@ -108,8 +108,8 @@ if (GTSAM_BUILD_STATIC_LIBRARY)
      	SOVERSION           ${gtsam_soversion})
 	if(WIN32) # Add 'lib' prefix to static library to avoid filename collision with shared library
 		set_target_properties(gtsam PROPERTIES
-			PREFIX "lib")
-			#COMPILE_DEFINITIONS GTSAM_IMPORT_STATIC)
+			PREFIX "lib"
+			COMPILE_DEFINITIONS GTSAM_IMPORT_STATIC)
 	endif()
     install(TARGETS gtsam EXPORT GTSAM-exports ARCHIVE DESTINATION lib)
     list(APPEND GTSAM_EXPORTED_TARGETS gtsam)