diff --git a/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pxd.pxi b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pxd.pxi
index 9f06ce086ee69..0307f74cbefb3 100644
--- a/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pxd.pxi
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pxd.pxi
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-cdef grpc_event _next(grpc_completion_queue *c_completion_queue, deadline)
+cdef grpc_event _next(grpc_completion_queue *c_completion_queue, deadline) except *
 
 
 cdef _interpret_event(grpc_event c_event)
diff --git a/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx.pxi b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx.pxi
index 212d27dc2b7dc..325e72afa0a0c 100644
--- a/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx.pxi
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx.pxi
@@ -20,7 +20,7 @@ import time
 cdef int _INTERRUPT_CHECK_PERIOD_MS = 200
 
 
-cdef grpc_event _next(grpc_completion_queue *c_completion_queue, deadline):
+cdef grpc_event _next(grpc_completion_queue *c_completion_queue, deadline) except *:
   cdef gpr_timespec c_increment
   cdef gpr_timespec c_timeout
   cdef gpr_timespec c_deadline