diff --git a/wally-pipelined/regression/regression-wally.sh b/wally-pipelined/regression/regression-wally.sh
index 0ef767548..161db493a 100755
--- a/wally-pipelined/regression/regression-wally.sh
+++ b/wally-pipelined/regression/regression-wally.sh
@@ -9,13 +9,13 @@ verilator_out=$(cd ..; ./lint-wally 2>&1)
 [[ -z $verilator_out ]] && echo "verilator passed" || echo "verilator failed"
 echo "starting Imperas rv64ic"
 sleep 1
-coproc rv64 {(check_test "sim-wally-batch" "All tests ran without failures.")}
+exec 3< <(check_test "sim-wally-batch" "All tests ran without failures.")
 echo "starting busybear"
 sleep 1
-coproc busybear {(check_test "sim-busybear-batch" "loaded 100000 instructions")}
-IFS= read -r -d '' -u "${rv64[0]}" rv64_out
+exec 4< <(check_test "sim-busybear-batch" "loaded 100000 instructions")
+rv64_out=$(cat <&3)
 [[ $rv64_out -eq 1 ]] && echo "rv64ic passed" || echo "rv64ic failed"
-IFS= read -r -d '' -u "${busybear[0]}" busybear_out
+busybear_out=$(cat <&4)
 [[ $busybear_out -eq 1 ]] && echo "busybear passed" || echo "busybear failed"
 
 #wait $(jobs -p)