diff --git a/sources/io.F90 b/sources/io.F90
index a0c5e8e..ceeaace 100644
--- a/sources/io.F90
+++ b/sources/io.F90
@@ -2819,7 +2819,7 @@ module io
         call XMLGetAttributeValue(xml_ptr, 'BinaryFiles', array_name, &
                                                           'data_type', str)
         select case(str)
-        case('float64', 'int64')
+        case('complex64', 'float64', 'int64')
           item_size = 8
         case('float32', 'int32')
           item_size = 4