diff --git a/process_maps.py b/process_maps.py
index 81f5689..125cec5 100755
--- a/process_maps.py
+++ b/process_maps.py
@@ -15,6 +15,7 @@
 import subprocess, sys, os, pprint, datetime, argparse, time
 
 base_path = os.path.dirname(os.path.realpath(__file__))
+env = os.environ.copy()
 
 FNULL = open(os.devnull, 'w')
 
@@ -65,13 +66,14 @@ if __name__ == '__main__':
 				subprocess.run([bunzip2_cmd, os.path.join(dirpath, file)])
 				
 	print('Processing maps using osmosis')
+	env['JAVACMD_OPTIONS'] = '-Djava.io.tmpdir=' + os.path.join(base_path, 'tmp') # Setup java temp dir to something a bit more sane (tmpfs /tmp for the loss)
 	files_to_process = []
 	for dirpath, dirnames, filenames in os.walk('dl'):
 		for file in filenames:
 			print('    Found map: ', end='')
 			print(os.path.join(dirpath, file))
 			files_to_process.append(os.path.join(dirpath, file))
-	osmosis_cmd = [os.path.join(base_path, 'bin', 'osmosis', 'bin', 'osmosis'), '-Djava.io.tmpdir=' + os.path.join(base_path, 'tmp')]
+	osmosis_cmd = [os.path.join(base_path, 'bin', 'osmosis', 'bin', 'osmosis')]
 	for file in files_to_process:
 		if file.endswith('osm'):
 			osmosis_cmd.extend(['--rx', 'file=' + file])
@@ -80,5 +82,6 @@ if __name__ == '__main__':
 	for x in range(0, len(files_to_process) - 1):
 		osmosis_cmd.append('--merge')
 	osmosis_cmd.extend(['--mapfile-writer', 'file=output.map', 'type=hd'])
-	subprocess.run(osmosis_cmd)
+	cmd = subprocess.Popen(osmosis_cmd, env=env)
+	cmd.wait()