diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 1d687161de2251c6cc18ba2b5628c08734e5e588..8aee47aa2c4986d6432136dc6b1483a26286b970 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -286,7 +286,7 @@ cfg_if! {
     } else if #[cfg(target_os = "emscripten")] {
         #[link(name = "c")]
         extern {}
-    } else if #[cfg(all(target_os = "netbsd", target_vendor = "rumprun"))] {
+    } else if #[cfg(all(target_os = "netbsd", cfg_attr(feature = "stdbuild", target_vendor = "rumprun")))] {
         // Since we don't use -nodefaultlibs on Rumprun, libc is always pulled
         // in automatically by the linker. We avoid passing it explicitly, as it
         // causes some versions of binutils to crash with an assertion failure.