diff --git a/src/lib.rs b/src/lib.rs
index 769816c..d3fa035 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -846,7 +846,7 @@ impl Config {
             }
         }
 
-        cmd.arg("--build").arg(".");
+        cmd.arg("--build").arg(&build);
 
         if !self.no_build_target {
             let target = self