diff --git a/applications/apertif/designs/apertif_unb1_correlator/tb/python/pi_apertif_unb1_correlator_offload.py b/applications/apertif/designs/apertif_unb1_correlator/tb/python/pi_apertif_unb1_correlator_offload.py
index f22a0de0ff0ecca2b4cadccb5c67eebb58b0006f..a42933dc95ef76ca929e038e39ac7d1e99612069 100644
--- a/applications/apertif/designs/apertif_unb1_correlator/tb/python/pi_apertif_unb1_correlator_offload.py
+++ b/applications/apertif/designs/apertif_unb1_correlator/tb/python/pi_apertif_unb1_correlator_offload.py
@@ -31,12 +31,11 @@
 #   . python pi_apertif_unb1_correlator_offload.py --unb 4 --fn 0 --reg eth_dst_mac=176156461036169,ip_dst_addr=180814078
 
 from pi_common import *
-import os
 
 PINAME   = 'REG_DP_OFFLOAD_TX_HDR_DAT'
 PID      = 'VIS_OFFLOAD'
 ADDR_W   = 6
-VHDL_SRC_FILE  = os.environ['RADIOHDL']+'trunk/applications/apertif/designs/apertif_unb1_correlator/src/vhdl/apertif_unb1_correlator_vis_offload.vhd'
+VHDL_SRC_FILE  = '../../src/vhdl/apertif_unb1_correlator_vis_offload.vhd'
 VHDL_SRC_CONST = 'c_hdr_field_arr'
 REGMAP = extract_regmap_from_vhd(VHDL_SRC_FILE, VHDL_SRC_CONST)