diff --git a/test-linuxcnc-source-link.sh b/test-linuxcnc-source-link.sh
index ff2471a..da48530 100755
--- a/test-linuxcnc-source-link.sh
+++ b/test-linuxcnc-source-link.sh
@@ -1459,6 +1459,11 @@ if CNC_SIM_RS274_FILE_MODE=1 CNC_SIM_RS274_VAR="$var_file" \
     echo "expected linuxcnc_abort_hot_comment.ngc to fail" >&2
     exit 1
 fi
+# Source basis: LinuxCNC src/emc/rs274ngc/interp_convert.cc
+# convert_comment() routes ABORT hot comments through convert_param_comment()
+# and setSavedError(), preserving expanded numbered and named parameters.
+grep -Fq "execute failed:  MixedCase param42=20.000000 named=4711.000000" \
+    "$output_dir/cnc_sim_linuxcnc_source_abort_hot_comment.err"
 if CNC_SIM_RS274_FILE_MODE=1 CNC_SIM_RS274_VAR="$var_file" \
     "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_ccomp_gouging_error.ngc \
     >"$output_dir/cnc_sim_linuxcnc_source_ccomp_gouging_error.json" 2>"$output_dir/cnc_sim_linuxcnc_source_ccomp_gouging_error.err"; then