diff --git a/molscribe/indigo/inchi.py b/molscribe/indigo/inchi.py
index 3a0cfd5..8e721d3 100644
--- a/molscribe/indigo/inchi.py
+++ b/molscribe/indigo/inchi.py
@@ -25,7 +25,7 @@ def __init__(self, indigo):
         if os.name == 'posix' and not platform.mac_ver()[0] and not platform.system().startswith("CYGWIN"):
             self._lib = CDLL(indigo.dllpath + "/libindigo-inchi.so")
         elif os.name == 'nt' or platform.system().startswith("CYGWIN"):
-            self._lib = CDLL(indigo.dllpath + "\indigo-inchi.dll")
+            self._lib = CDLL(indigo.dllpath + "/indigo-inchi.dll")
         elif platform.mac_ver()[0]:
             self._lib = CDLL(indigo.dllpath + "/libindigo-inchi.dylib")
         else:
diff --git a/molscribe/indigo/renderer.py b/molscribe/indigo/renderer.py
index 699c80e..e2e22c8 100644
--- a/molscribe/indigo/renderer.py
+++ b/molscribe/indigo/renderer.py
@@ -33,7 +33,7 @@ def __init__(self, indigo):
         ):
             self._lib = CDLL(indigo.dllpath + "/libindigo-renderer.so")
         elif os.name == "nt" or platform.system().startswith("CYGWIN"):
-            self._lib = CDLL(indigo.dllpath + "\indigo-renderer.dll")
+            self._lib = CDLL(indigo.dllpath + "/indigo-renderer.dll")
         elif platform.mac_ver()[0]:
             self._lib = CDLL(indigo.dllpath + "/libindigo-renderer.dylib")
         else:
diff --git a/molscribe/utils.py b/molscribe/utils.py
index d1dd833..cab5f99 100755
--- a/molscribe/utils.py
+++ b/molscribe/utils.py
@@ -22,7 +22,7 @@
     },
     "nodes": {"max_len": 384},
     "atomtok_coords": {"max_len": 480},
-    "chartok_coords": {"max_len": 480}
+    "chartok_coords": {"max_len": 1280}
 }