diff --git a/labscript/labscript.py b/labscript/labscript.py
index 7f87d2e..2927ef5 100644
--- a/labscript/labscript.py
+++ b/labscript/labscript.py
@@ -13,7 +13,6 @@
 
 from __future__ import division, unicode_literals, print_function, absolute_import
 from labscript_utils import PY2
-from labscript_utils.numpy_dtype_workaround import dtype_workaround
 if PY2:
     str = unicode
     import __builtin__ as builtins
@@ -1787,7 +1786,7 @@ def close(self, t):
 
     def generate_code(self, hdf5_file):
         classname = self.__class__.__name__
-        calibration_table_dtypes = dtype_workaround([('name','a256'), ('open_delay',float), ('close_delay',float)])
+        calibration_table_dtypes = [('name','a256'), ('open_delay',float), ('close_delay',float)]
         if classname not in hdf5_file['calibrations']:
             hdf5_file['calibrations'].create_dataset(classname, (0,), dtype=calibration_table_dtypes, maxshape=(None,))
         metadata = (self.name,self.open_delay,self.close_delay)
@@ -2124,7 +2123,7 @@ class LabscriptError(Exception):
 
 def save_time_markers(hdf5_file):
     time_markers = compiler.time_markers
-    dtypes = dtype_workaround([('label','a256'), ('time', float), ('color', '(1,3)int')])
+    dtypes = [('label','a256'), ('time', float), ('color', '(1,3)int')]
     data_array = zeros(len(time_markers), dtype=dtypes)
     for i, t in enumerate(time_markers):
         data_array[i] = time_markers[t]["label"], t, time_markers[t]["color"]
@@ -2170,10 +2169,10 @@ def generate_connection_table(hdf5_file):
     
     connection_table.sort()
     vlenstring = h5py.special_dtype(vlen=str)
-    connection_table_dtypes = dtype_workaround([('name','a256'), ('class','a256'), ('parent','a256'), ('parent port','a256'),
+    connection_table_dtypes = [('name','a256'), ('class','a256'), ('parent','a256'), ('parent port','a256'),
                                ('unit conversion class','a256'), ('unit conversion params', vlenstring),
                                ('BLACS_connection','a'+str(max_BLACS_conn_length)),
-                               ('properties', vlenstring)])
+                               ('properties', vlenstring)]
     connection_table_array = empty(len(connection_table),dtype=connection_table_dtypes)
     for i, row in enumerate(connection_table):
         connection_table_array[i] = row
@@ -2257,7 +2256,7 @@ def write_device_properties(hdf5_file):
 
 
 def generate_wait_table(hdf5_file):
-    dtypes = dtype_workaround([('label','a256'), ('time', float), ('timeout', float)])
+    dtypes = [('label','a256'), ('time', float), ('timeout', float)]
     data_array = zeros(len(compiler.wait_table), dtype=dtypes)
     for i, t in enumerate(sorted(compiler.wait_table)):
         label, timeout = compiler.wait_table[t]