diff --git a/CMakeLists.txt b/CMakeLists.txt
index 334b5c3865..bba514a258 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1499,7 +1499,7 @@ endif()
 option(ENABLE_UNIX_SOCKETS "Enable Unix domain sockets support" ON)
 if(ENABLE_UNIX_SOCKETS AND NOT WINCE)
   if(WIN32 OR DOS)
-    set(USE_UNIX_SOCKETS ON)
+    set(USE_UNIX_SOCKETS 1)
   else()
     include(CheckStructHasMember)
     check_struct_has_member("struct sockaddr_un" "sun_path" "sys/un.h" USE_UNIX_SOCKETS)