diff --git a/internal/rosa/ninja.go b/internal/rosa/ninja.go
index 5b84f8c..76f0340 100644
--- a/internal/rosa/ninja.go
+++ b/internal/rosa/ninja.go
@@ -12,12 +12,15 @@ func (t Toolchain) newNinja() pkg.Artifact {
 		t.Load(Python),
 		t.Load(Bash),
 	}, nil, nil, `
-mkdir -p /work/system/bin/ && cd /work/system/bin/
+cd "$(mktemp -d)"
 python3 /usr/src/ninja/configure.py \
 	--bootstrap \
 	--gtest-source-dir=/usr/src/googletest
 ./ninja all
 ./ninja_test
+
+mkdir -p /work/system/bin/
+cp ninja /work/system/bin/
 `, pkg.Path(AbsUsrSrc.Append("googletest"), false,
 		pkg.NewHTTPGetTar(
 			nil, "https://github.com/google/googletest/releases/download/"+