diff --git a/app/src/server.c b/app/src/server.c
index 1697a000..cb2a24db 100644
--- a/app/src/server.c
+++ b/app/src/server.c
@@ -392,7 +392,7 @@ server_init(struct server *server) {
 static int
 run_wait_server(void *data) {
     struct server *server = data;
-    process_wait(server->process, NULL); // ignore exit code
+    process_wait_noclose(server->process, NULL); // ignore exit code
 
     mutex_lock(server->mutex);
     server->process_terminated = true;
@@ -550,14 +550,14 @@ server_stop(struct server *server) {
     // On some devices, closing the sockets is not sufficient to wake up the
     // blocking calls while the device is asleep.
     if (r == SDL_MUTEX_TIMEDOUT) {
-        // FIXME There is a race condition here: there is a small chance that
-        // the process is already terminated, and the PID assigned to a new
-        // process.
+        // The process is terminated, but not reaped (closed) yet, so its PID
+        // is still valid.
         LOGW("Killing the server...");
         process_terminate(server->process);
     }
 
     SDL_WaitThread(server->wait_server_thread, NULL);
+    process_close(server->process);
 }
 
 void
diff --git a/app/src/sys/unix/process.c b/app/src/sys/unix/process.c
index 3f95ce7f..00a8d81c 100644
--- a/app/src/sys/unix/process.c
+++ b/app/src/sys/unix/process.c
@@ -134,15 +134,21 @@ process_terminate(pid_t pid) {
     return kill(pid, SIGTERM) != -1;
 }
 
-bool
-process_wait(pid_t pid, int *exit_code) {
-    int status;
+static bool
+process_wait_internal(pid_t pid, int *exit_code, bool close) {
     int code;
-    if (waitpid(pid, &status, 0) == -1 || !WIFEXITED(status)) {
+    int options = WEXITED;
+    if (!close) {
+        options |= WNOWAIT;
+    }
+
+    siginfo_t info;
+    int r = waitid(P_PID, pid, &info, options);
+    if (r == -1 || info.si_code != CLD_EXITED) {
         // could not wait, or exited unexpectedly, probably by a signal
         code = -1;
     } else {
-        code = WEXITSTATUS(status);
+        code = info.si_status;
     }
     if (exit_code) {
         *exit_code = code;
@@ -150,6 +156,21 @@ process_wait(pid_t pid, int *exit_code) {
     return !code;
 }
 
+bool
+process_wait(pid_t pid, int *exit_code) {
+    return process_wait_internal(pid, exit_code, true);
+}
+
+bool
+process_wait_noclose(pid_t pid, int *exit_code) {
+    return process_wait_internal(pid, exit_code, false);
+}
+
+void
+process_close(pid_t pid) {
+    process_wait_internal(pid, NULL, true);
+}
+
 char *
 get_executable_path(void) {
 // <https://stackoverflow.com/a/1024937/1987178>
diff --git a/app/src/sys/win/process.c b/app/src/sys/win/process.c
index c30e751b..f2a86b22 100644
--- a/app/src/sys/win/process.c
+++ b/app/src/sys/win/process.c
@@ -1,5 +1,6 @@
 #include "util/process.h"
 
+#include <assert.h>
 #include <sys/stat.h>
 
 #include "config.h"
@@ -59,8 +60,8 @@ process_terminate(HANDLE handle) {
     return TerminateProcess(handle, 1);
 }
 
-bool
-process_wait(HANDLE handle, DWORD *exit_code) {
+static bool
+process_wait_internal(HANDLE handle, DWORD *exit_code, bool close) {
     DWORD code;
     if (WaitForSingleObject(handle, INFINITE) != WAIT_OBJECT_0
             || !GetExitCodeProcess(handle, &code)) {
@@ -70,10 +71,29 @@ process_wait(HANDLE handle, DWORD *exit_code) {
     if (exit_code) {
         *exit_code = code;
     }
-    CloseHandle(handle);
+    if (close) {
+        CloseHandle(handle);
+    }
     return !code;
 }
 
+bool
+process_wait(HANDLE handle, DWORD *exit_code) {
+    return process_wait_internal(handle, exit_code, true);
+}
+
+bool
+process_wait_noclose(HANDLE handle, DWORD *exit_code) {
+    return process_wait_internal(handle, exit_code, false);
+}
+
+void
+process_close(HANDLE handle) {
+    bool closed = CloseHandle(handle);
+    assert(closed);
+    (void) closed;
+}
+
 char *
 get_executable_path(void) {
     HMODULE hModule = GetModuleHandleW(NULL);
diff --git a/app/src/util/process.h b/app/src/util/process.h
index 58328a3e..ad2bc0d0 100644
--- a/app/src/util/process.h
+++ b/app/src/util/process.h
@@ -46,10 +46,20 @@ process_execute(const char *const argv[], process_t *process);
 bool
 process_terminate(process_t pid);
 
-// wait and close the process
+// wait and close the process (like waitpid())
 bool
 process_wait(process_t pid, exit_code_t *exit_code);
 
+// wait (but does not close) the process (waitid() with WNOWAIT)
+bool
+process_wait_noclose(process_t pid, exit_code_t *exit_code);
+
+// close the process
+//
+// Semantically, process_wait = process_wait_noclose + process_close.
+void
+process_close(process_t pid);
+
 // convenience function to wait for a successful process execution
 // automatically log process errors with the provided process name
 bool