diff --git a/create_project.tcl b/create_project.tcl
index b00e0f3..a57f886 100644
--- a/create_project.tcl
+++ b/create_project.tcl
@@ -71,6 +71,9 @@ set_property include_dirs ${PROJECT_DIR} [current_fileset -simset]
 set_property -name {xsim.simulate.runtime} -value {all} -objects [get_filesets sim_1]
 set_property -name {xsim.elaborate.xelab.more_options} -value {--timescale 1ns/1ps} -objects [get_filesets sim_1]
 
+# Set simulation working directory to project root (for $readmemh to find vectors/)
+set_property -name {xsim.simulate.xsim.more_options} -value "-cd ${PROJECT_DIR}" -objects [get_filesets sim_1]
+
 # Save project
 puts "========================================"
 puts " Project created: ${PROJECT_DIR}/vivado_prj/${PROJECT_NAME}.xpr"