diff --git a/benchmarks/rich/scripts/simulate.py b/benchmarks/rich/scripts/simulate.py
index a750db15ba98a53bcc534a4f435b754af6a105a1..d715c0f5a1a869947ceb4e3b29a1d6eb8a771146 100755
--- a/benchmarks/rich/scripts/simulate.py
+++ b/benchmarks/rich/scripts/simulate.py
@@ -194,10 +194,10 @@ paramList=f'params_{outputName}'
 #os.system(f'npdet_info'); print(sep) #########
 #os.system(f'npdet_info search {XRICH} --value {compactFileFull} > {paramList}.py')
 with open(paramList+'.py','w') as paramListFile:
-    subprocess.run(shlex.split(f'npdet_info search {XRICH} --value {compactFileFull}'),stdout=paramListFile)
+    subprocess.call(shlex.split(f'npdet_info search {XRICH} --value {compactFileFull}'),stdout=paramListFile)
 paramListFile.close()
 #print("** compact file params **"); os.system(f'cat {paramList}.py'); print(sep) #########
-print("** compact file params **"); subprocess.run(shlex.split(f'cat {paramList}.py')); print(sep) #########
+print("** compact file params **"); subprocess.call(shlex.split(f'cat {paramList}.py')); print(sep) #########
 sys.path.append(os.getcwd())
 params = importlib.import_module(paramList)
 
@@ -363,7 +363,7 @@ cmd += " --enableG4GPS"
 print(sep)
 print(cmd)
 print(sep)
-subprocess.run(shlex.split(cmd))
+subprocess.call(shlex.split(cmd))
 
 ### cleanup
 os.remove(m.name) # remove macro