diff --git a/lib/spack/spack/concretize.py b/lib/spack/spack/concretize.py
index f32e956a131..2013ae2e84a 100644
--- a/lib/spack/spack/concretize.py
+++ b/lib/spack/spack/concretize.py
@@ -306,7 +306,7 @@ def _proper_compiler_style(cspec, target):
             raise UnavailableCompilerVersionError(other_compiler)
             
         # copy concrete version into other_compiler
-        spec.compiler = matches[0].copy()
+        spec.compiler = matches[-1].copy()
         assert(spec.compiler.concrete)
         return True  # things changed.