diff --git a/schainpy/model/cfunctions.pyx b/schainpy/model/cfunctions.pyx
index ebd7da4..9f6f79f 100644
--- a/schainpy/model/cfunctions.pyx
+++ b/schainpy/model/cfunctions.pyx
@@ -1,7 +1,7 @@
 import numpy
 cimport numpy
  
-def decoder(numpy.ndarray[numpy.float32_t, ndim=2] fft_code, numpy.ndarray[numpy.float32_t, ndim=2] data):
+def decoder(numpy.ndarray[numpy.float32, ndim=2] fft_code, numpy.ndarray[numpy.complex, ndim=2] data):
 
     fft_data = numpy.fft.fft(data, axis=1)
     conv = fft_data*fft_code