diff --git a/src/core/exec-invoke.c b/src/core/exec-invoke.c
index 39b087a3d9..3dff605021 100644
--- a/src/core/exec-invoke.c
+++ b/src/core/exec-invoke.c
@@ -4293,7 +4293,7 @@ static int close_remaining_fds(
                 size_t n_fds) {
 
         size_t n_dont_close = 0;
-        int dont_close[n_fds + 17];
+        int dont_close[n_fds + 19];
 
         assert(params);
         assert(runtime);