diff --git a/modules/base/pymod/__init__.py.in b/modules/base/pymod/__init__.py.in
index 3043b7d56cfe9205b23c1de83e7c2b5a2a2ba3ef..2fabb1b7f05d65b63f2d9b4423f184a73a285bcb 100644
--- a/modules/base/pymod/__init__.py.in
+++ b/modules/base/pymod/__init__.py.in
@@ -90,6 +90,9 @@ def _SetupCompoundsLib():
   try:
     _TrySetCompoundsLib(compound_lib_path)
   except ValueError:
+    if compound_lib_path:
+      LogWarning("Could not load $OST_COMPOUNDS_CHEMLIB as a compound library"
+                 ": '%s'. Falling back to default." % ( compound_lib_path))
     pass
   else:
     return