diff --git a/src/network/CMakeLists.txt b/src/network/CMakeLists.txt
index 5cfa87d91..c01c3643b 100644
--- a/src/network/CMakeLists.txt
+++ b/src/network/CMakeLists.txt
@@ -16,8 +16,12 @@
 add_library(net OBJECT network.c net_pcap.c net_slirp.c net_dp8390.c net_3c503.c
     net_ne2000.c net_pcnet.c net_wd8003.c net_plip.c)
 
-option(SLIRP_EXTERNAL "Link against the system-provided libslirp library" OFF)
-mark_as_advanced(SLIRP_EXTERNAL)
+if(NOT WIN32 AND NOT APPLE)
+    set(SLIRP_EXTERNAL 1)
+else()
+    option(SLIRP_EXTERNAL "Link against the system-provided libslirp library" OFF)
+    mark_as_advanced(SLIRP_EXTERNAL)
+endif()
 
 if(SLIRP_EXTERNAL)
     find_package(PkgConfig REQUIRED)
@@ -26,4 +30,4 @@ if(SLIRP_EXTERNAL)
 else()
     add_subdirectory(slirp)
     target_link_libraries(86Box slirp)
-endif()
\ No newline at end of file
+endif()