diff --git a/lib/spack/env/cc b/lib/spack/env/cc
index c6a09724e9..17740250d1 100755
--- a/lib/spack/env/cc
+++ b/lib/spack/env/cc
@@ -293,9 +293,9 @@ for dep in "${deps[@]}"; do
     if [[ -d $dep/lib64 ]]; then
         # libraries+=("$dep/lib64")
         if [[ $mode = ccld ]]; then
-            args=("-L$dep/lib" "-Wl,-rpath,$dep/lib" "${args[@]}")
+            args=("-L$dep/lib64" "-Wl,-rpath,$dep/lib64" "${args[@]}")
         elif [[ $mode = ld ]]; then
-            args=("-L$dep/lib" "-rpath" "$dep/lib" "${args[@]}")
+            args=("-L$dep/lib64" "-rpath" "$dep/lib64" "${args[@]}")
         fi
     fi
 done