diff --git a/src/misc/bitSet.cpp b/src/misc/bitSet.cpp
index 2da4fd8..2d34591 100644
--- a/src/misc/bitSet.cpp
+++ b/src/misc/bitSet.cpp
@@ -279,7 +279,8 @@ namespace epics { namespace pvData {
         uint32 inUse = (set1.wordsInUse < set2.wordsInUse) ? set1.wordsInUse : set2.wordsInUse;
 
         ensureCapacity(inUse);
-        wordsInUse = inUse;
+        if(inUse>wordsInUse)
+            wordsInUse = inUse;
 
         // Perform logical AND on words in common
         for (uint32 i = 0; i < inUse; i++)
diff --git a/testApp/misc/testBitSet.cpp b/testApp/misc/testBitSet.cpp
index 005e1ba..a378201 100644
--- a/testApp/misc/testBitSet.cpp
+++ b/testApp/misc/testBitSet.cpp
@@ -152,9 +152,7 @@ static void testOperators()
     b3.clear(); b3.set(1);
     std::cout<<"# "<<toString(b3)<<" |= "<<toString(b1)<<" & "<<toString(b2)<<"\n";
     b3.or_and(b1, b2);
-    testTodoBegin("Bug in or_and");
     testOk(toString(b3) == "{1}", "%s == {1}", toString(b3).c_str());
-    testTodoEnd();
 }