diff --git a/iris_grib/_save_rules.py b/iris_grib/_save_rules.py
index cb331cf29..0f0e4df35 100644
--- a/iris_grib/_save_rules.py
+++ b/iris_grib/_save_rules.py
@@ -1490,12 +1490,6 @@ def data_section(cube, grib):
         gribapi.grib_set(grib, "bitmapPresent", 1)
         gribapi.grib_set_double(grib, "missingValue", fill_value)
 
-    # A segmentation fault is raised by `gribapi.grib_set_double_array` if it
-    # tries to cast large data to float64. As a temporary fix we cast the data
-    # upfront
-    # TODO: remove the `astype` command once eccodes (gribapi) has been fixed.
-    if data.dtype != np.float64:
-        data = data.astype(np.float64)
     gribapi.grib_set_double_array(grib, "values", data.flatten())
 
     # todo: check packing accuracy?