diff --git a/interfaces/cython/cantera/func1.pxd b/interfaces/cython/cantera/func1.pxd
index e8747632c6..eaf11e190a 100644
--- a/interfaces/cython/cantera/func1.pxd
+++ b/interfaces/cython/cantera/func1.pxd
@@ -6,13 +6,20 @@
 
 from .ctcxx cimport *
 
+cdef extern from "cantera/numerics/Func1.h":
+    cdef cppclass CxxFunc1 "Cantera::Func1":
+        double eval(double) except +translate_exception
+
+    cdef cppclass CxxTabulated1 "Cantera::Tabulated1" (CxxFunc1):
+        CxxTabulated1(int, double*, double*, string) except +translate_exception
+        double eval(double) except +translate_exception
+
 cdef extern from "cantera/cython/funcWrapper.h":
     ctypedef double (*callback_wrapper)(double, void*, void**) except? 0.0
     cdef int translate_exception()
 
-    cdef cppclass CxxFunc1 "Func1Py":
-        CxxFunc1(callback_wrapper, void*)
-        double eval(double) except +translate_exception
+    cdef cppclass CxxFunc1Py "Func1Py" (CxxFunc1):
+        CxxFunc1Py(callback_wrapper, void*)
 
     cdef cppclass PyFuncInfo:
         PyFuncInfo()
@@ -24,12 +31,6 @@ cdef extern from "cantera/cython/funcWrapper.h":
         void setExceptionValue(PyObject*)
 
 
-cdef extern from "cantera/numerics/Func1.h":
-    cdef cppclass CxxTabulated1 "Cantera::Tabulated1":
-        CxxTabulated1(int, double*, double*, string) except +translate_exception
-        double eval(double) except +translate_exception
-
-
 cdef class Func1:
     cdef shared_ptr[CxxFunc1] _func
     cdef CxxFunc1* func
diff --git a/interfaces/cython/cantera/func1.pyx b/interfaces/cython/cantera/func1.pyx
index 71148294c4..51f0a9b6de 100644
--- a/interfaces/cython/cantera/func1.pyx
+++ b/interfaces/cython/cantera/func1.pyx
@@ -90,7 +90,7 @@ cdef class Func1:
 
     cpdef void _set_callback(self, c) except *:
         self.callable = c
-        self._func.reset(new CxxFunc1(func_callback, <void*>self))
+        self._func.reset(new CxxFunc1Py(func_callback, <void*>self))
         self.func = self._func.get()
 
     def __call__(self, t):