diff --git a/var/spack/repos/builtin/packages/osu-micro-benchmarks/package.py b/var/spack/repos/builtin/packages/osu-micro-benchmarks/package.py
index 204e4e97f74..55e5563a532 100644
--- a/var/spack/repos/builtin/packages/osu-micro-benchmarks/package.py
+++ b/var/spack/repos/builtin/packages/osu-micro-benchmarks/package.py
@@ -69,7 +69,7 @@ def configure_args(self):
             config_args.extend(["--enable-rocm", "--with-rocm=%s" % spec["hip"].prefix])
             rocm_arch = spec.variants["amdgpu_target"].value
             if "none" not in rocm_arch:
-                config_args.append("HCC_AMDGPU_TARGET=" + " ".join(self.hip_flags(rocm_arch)))
+                config_args.append("HCC_AMDGPU_TARGET=" + self.hip_flags(rocm_arch))
 
         if "+papi" in spec:
             config_args.extend(["--enable-papi", "--with-papi=%s" % spec["papi"].prefix])