diff --git a/src/parallel_io.c b/src/parallel_io.c
index 8c4f39039c37dfa48a51a2a635252ba77e255b9f..c7b9dac36563b84837115e88af1cea7005fdf9fb 100644
--- a/src/parallel_io.c
+++ b/src/parallel_io.c
@@ -331,8 +331,7 @@ void prepareArray(struct engine* e, hid_t grp, char* fileName, FILE* xmfFile,
   io_write_attribute_d(
       h_data, "CGS conversion factor",
       units_cgs_conversion_factor(snapshot_units, props.units));
-  io_write_attribute_f(h_data, "h-scale exponent",
-                       units_h_factor(snapshot_units, props.units));
+  io_write_attribute_f(h_data, "h-scale exponent", 0);
   io_write_attribute_f(h_data, "a-scale exponent",
                        units_a_factor(snapshot_units, props.units));
   io_write_attribute_s(h_data, "Conversion factor", buffer);
diff --git a/src/serial_io.c b/src/serial_io.c
index 921d6efe64bb56dcac09498ad0d2b407cf5eac35..09538189b0d2661a329d35254f6eb39c558df653 100644
--- a/src/serial_io.c
+++ b/src/serial_io.c
@@ -275,8 +275,7 @@ void prepareArray(const struct engine* e, hid_t grp, char* fileName,
   io_write_attribute_d(
       h_data, "CGS conversion factor",
       units_cgs_conversion_factor(snapshot_units, props.units));
-  io_write_attribute_f(h_data, "h-scale exponent",
-                       units_h_factor(snapshot_units, props.units));
+  io_write_attribute_f(h_data, "h-scale exponent", 0);
   io_write_attribute_f(h_data, "a-scale exponent",
                        units_a_factor(snapshot_units, props.units));
   io_write_attribute_s(h_data, "Conversion factor", buffer);
diff --git a/src/single_io.c b/src/single_io.c
index 6950a1c7b75fc6f5db240a7a612de09601fccb4b..5a96c3c5509d3987a4e1115e2111f82edc49f322 100644
--- a/src/single_io.c
+++ b/src/single_io.c
@@ -289,8 +289,7 @@ void writeArray(const struct engine* e, hid_t grp, char* fileName,
   io_write_attribute_d(
       h_data, "CGS conversion factor",
       units_cgs_conversion_factor(snapshot_units, props.units));
-  io_write_attribute_f(h_data, "h-scale exponent",
-                       units_h_factor(snapshot_units, props.units));
+  io_write_attribute_f(h_data, "h-scale exponent", 0);
   io_write_attribute_f(h_data, "a-scale exponent",
                        units_a_factor(snapshot_units, props.units));
   io_write_attribute_s(h_data, "Conversion factor", buffer);