diff --git a/snakehouse/constants.py b/snakehouse/constants.py
index 3f66461b474aabc0f402ee6f0af4dc71751c9f16..7fc2acef5d8d42e7e3f4ba38049dff511efce2e4 100644
--- a/snakehouse/constants.py
+++ b/snakehouse/constants.py
@@ -66,7 +66,7 @@ bootstrap_cython_submodules()
 BOOTSTRAP_PYX_CDEF = """
 cdef extern from "%s":
     object PyInit_%s()    
-'"""
+"""
 
 BOOTSTRAP_PYX_GET_DEFINITION_HEADER = """
 cdef object get_definition_by_name(str name):