diff --git a/tools/server/server-models.cpp b/tools/server/server-models.cpp
index f8a10deb5e..a316e0033a 100644
--- a/tools/server/server-models.cpp
+++ b/tools/server/server-models.cpp
@@ -9,8 +9,13 @@
 #include <thread>
 #include <mutex>
 #include <condition_variable>
+
+#if !defined(_WIN32)
 #include <spawn.h>
-#include <signal.h> // for kill()
+#include <signal.h>   // kill()
+#include <sys/wait.h> // waitpid()
+#include <unistd.h>   // readlink()
+#endif
 
 #if defined(__APPLE__) && defined(__MACH__)
 // macOS: use _NSGetExecutablePath to get the executable path
diff --git a/tools/server/server-models.h b/tools/server/server-models.h
index 094b287b56..c3f6900c44 100644
--- a/tools/server/server-models.h
+++ b/tools/server/server-models.h
@@ -7,6 +7,16 @@
 #include <mutex>
 #include <condition_variable>
 
+// pid_t is defined in <sys/types.h> on POSIX systems. On Windows, this
+// header doesn't exist and the server code is not expected to build/run,
+// but provide a minimal fallback typedef to avoid include errors when this
+// header is parsed in non-POSIX builds.
+#if defined(_WIN32)
+using pid_t = int;
+#else
+#include <sys/types.h>
+#endif
+
 enum server_model_status {
     SERVER_MODEL_STATUS_UNLOADED,
     SERVER_MODEL_STATUS_LOADING,
@@ -34,6 +44,7 @@ static std::string server_model_status_to_string(server_model_status status) {
         case SERVER_MODEL_STATUS_LOADING:  return "loading";
         case SERVER_MODEL_STATUS_LOADED:   return "loaded";
         case SERVER_MODEL_STATUS_FAILED:   return "failed";
+        default:                           return "unknown";
     }
 }
 
diff --git a/tools/server/server.cpp b/tools/server/server.cpp
index 5377d79812..19cb39c290 100644
--- a/tools/server/server.cpp
+++ b/tools/server/server.cpp
@@ -5662,6 +5662,7 @@ int main(int argc, char ** argv, char ** envp) {
     // register API routes
     server_routes routes(params, ctx_server, ctx_http);
 
+    // TODO: improve this by changing arg.cpp
     bool is_router_server = params.model.path == DEFAULT_MODEL_PATH;
     if (is_router_server) {
         // setup server instances manager