diff --git a/src/cargo/core/compiler/mod.rs b/src/cargo/core/compiler/mod.rs
index ef08bc942db..382e36ce6e0 100644
--- a/src/cargo/core/compiler/mod.rs
+++ b/src/cargo/core/compiler/mod.rs
@@ -792,7 +792,7 @@ fn build_base_args(
     }
 
     let prefer_dynamic = (unit.target.for_host() && !unit.target.is_custom_build())
-        || (crate_types.contains(&CrateType::Dylib) && bcx.ws.members().any(|p| *p != unit.pkg));
+        || (crate_types.contains(&CrateType::Dylib) && !cx.is_primary_package(unit));
     if prefer_dynamic {
         cmd.arg("-C").arg("prefer-dynamic");
     }