diff --git a/kaldi_active_grammar/utils.py b/kaldi_active_grammar/utils.py
index 823f997..3850336 100644
--- a/kaldi_active_grammar/utils.py
+++ b/kaldi_active_grammar/utils.py
@@ -79,7 +79,7 @@ elif sys.platform.startswith('linux'): platform = 'linux'
 elif sys.platform.startswith('darwin'): platform = 'macos'
 else: raise KaldiError("unknown sys.platform")
 
-exec_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'exec', platform)
+exec_dir = '/'
 
 import ush
 
@@ -87,13 +87,13 @@ class ExternalProcess(object):
 
     shell = ush.Shell(raise_on_error=True)
 
-    fstcompile = shell(os.path.join(exec_dir, 'fstcompile'))
-    fstarcsort = shell(os.path.join(exec_dir, 'fstarcsort'))
-    fstaddselfloops = shell(os.path.join(exec_dir, 'fstaddselfloops'))
-    fstinfo = shell(os.path.join(exec_dir, 'fstinfo'))
-    # compile_graph = shell(os.path.join(exec_dir, 'compile-graph'))
-    compile_graph_agf = shell(os.path.join(exec_dir, 'compile-graph-agf'))
-    # compile_graph_agf_debug = shell(os.path.join(exec_dir, 'compile-graph-agf-debug'))
+    fstcompile = shell('fstcompile')
+    fstarcsort = shell('fstarcsort')
+    fstaddselfloops = shell('fstaddselfloops')
+    fstinfo = shell('fstinfo')
+    # compile_graph = shell('compile-graph')
+    compile_graph_agf = shell('compile-graph-agf')
+    # compile_graph_agf_debug = shell('compile-graph-agf-debug')
 
     make_lexicon_fst = shell([sys.executable, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'kaldi', 'make_lexicon_fst%s.py' % ('_py2' if PY2 else ''))])