diff --git a/src/gstools/field/summator.pyx b/src/gstools/field/summator.pyx
index cb84bc6f1..5ee2ff042 100644
--- a/src/gstools/field/summator.pyx
+++ b/src/gstools/field/summator.pyx
@@ -4,7 +4,7 @@ This is the randomization method summator, implemented in cython.
 """
 
 import numpy as np
-from cython.parallel import parallel, prange
+from cython.parallel import prange
 
 try:
     cimport openmp