diff --git a/interfaces/cython/SConscript b/interfaces/cython/SConscript
index 4e2723fc2..3a80e39ae 100644
--- a/interfaces/cython/SConscript
+++ b/interfaces/cython/SConscript
@@ -33,6 +33,7 @@ def configure_python(env, python_command):
 def add_dependencies(mod, ext):
     localenv.Depends(mod, ext)
     localenv.Depends(mod, dataFiles + testFiles + scripts)
+    localenv.Depends(ext, localenv['cantera_staticlib'])
 
     for f in (mglob(localenv, 'cantera/test', 'py') +
               mglob(localenv, 'cantera/mixmaster', 'py') +