diff --git a/pyfda/libs/pyfda_fix_lib.py b/pyfda/libs/pyfda_fix_lib.py
index c075b1f32..fbe69a136 100644
--- a/pyfda/libs/pyfda_fix_lib.py
+++ b/pyfda/libs/pyfda_fix_lib.py
@@ -690,7 +690,11 @@ def fixp(self, y, scaling='mult'):
         if np.iscomplexobj(y):
             logger.warning("Casting complex values to real before quantization!")
             # quantizing complex objects is not supported yet
-            y = y.real
+            # y = y.real
+            yq = self.fixp(y.real, scaling=scaling) + 1j * self.fixp(y.imag, scaling=scaling)
+            logger.warning(yq)
+            return yq
+
 
         y_in = y  # store y before scaling / quantizing
         # ======================================================================