diff --git a/openmc/capi/core.py b/openmc/capi/core.py
index 922877c8e..ad4f77dff 100644
--- a/openmc/capi/core.py
+++ b/openmc/capi/core.py
@@ -17,7 +17,8 @@ class _Bank(Structure):
                 ('u', c_double*3),
                 ('E', c_double),
                 ('wgt', c_double),
-                ('delayed_group', c_int)]
+                ('delayed_group', c_int),
+                ('particle', c_int)]
 
 
 # Define input type for numpy arrays that will be passed into C++ functions
diff --git a/src/state_point.cpp b/src/state_point.cpp
index ab1473403..d657316f9 100644
--- a/src/state_point.cpp
+++ b/src/state_point.cpp
@@ -480,6 +480,7 @@ hid_t h5banktype() {
   H5Tinsert(banktype, "E", HOFFSET(Particle::Bank, E), H5T_NATIVE_DOUBLE);
   H5Tinsert(banktype, "wgt", HOFFSET(Particle::Bank, wgt), H5T_NATIVE_DOUBLE);
   H5Tinsert(banktype, "delayed_group", HOFFSET(Particle::Bank, delayed_group), H5T_NATIVE_INT);
+  H5Tinsert(banktype, "particle", HOFFSET(Particle::Bank, particle), H5T_NATIVE_INT);
 
   H5Tclose(postype);
   return banktype;