diff --git a/sparta/simdb/test/HDF5Database/HDF5Database_test.cpp b/sparta/simdb/test/HDF5Database/HDF5Database_test.cpp
index ea42a68283..85f6372af8 100644
--- a/sparta/simdb/test/HDF5Database/HDF5Database_test.cpp
+++ b/sparta/simdb/test/HDF5Database/HDF5Database_test.cpp
@@ -210,9 +210,9 @@ struct CompoundWithMatrixPOD
 CompoundWithMatrixPOD createRandomCompoundWithMatrixPOD()
 {
     CompoundWithMatrixPOD comp;
-    comp.ch  = chooseRand<char>();
-    comp.i1  = chooseRand<int8_t>();
-    comp.ui1 = chooseRand<uint8_t>();
+    comp.ch  = (char)   chooseRand<uint16_t>();
+    comp.i1  = (int8_t) chooseRand<int16_t>();
+    comp.ui1 = (uint8_t)chooseRand<uint16_t>();
     comp.i2  = chooseRand<int16_t>();
     comp.ui2 = chooseRand<uint16_t>();
     comp.i4  = chooseRand<int32_t>();