diff --git a/src/OpenFOAM/containers/Bits/PackedList/PackedListI.H b/src/OpenFOAM/containers/Bits/PackedList/PackedListI.H
index e78ecdb325eba960c2510548bafd9b751b428c75..1c86e05125ce15f33886c3e8d50aad0de9ad4474 100644
--- a/src/OpenFOAM/containers/Bits/PackedList/PackedListI.H
+++ b/src/OpenFOAM/containers/Bits/PackedList/PackedListI.H
@@ -716,10 +716,9 @@ template<unsigned Width>
 inline typename Foam::PackedList<Width>::reference
 Foam::PackedList<Width>::operator[](const label i)
 {
-    // Leave enabled during testing period (MAR-2018)
-    // #ifdef FULLDEBUG
+    #ifdef FULLDEBUG
     checkIndex(i);
-    // #endif
+    #endif
     return reference(this, i);
 }
 
diff --git a/src/OpenFOAM/containers/Bits/bitSet/bitSetI.H b/src/OpenFOAM/containers/Bits/bitSet/bitSetI.H
index 18e99a2d83c049403bccbb19f9c086a9b7a93ea0..afc7d93f9719743939df5ad61387773b0172e991 100644
--- a/src/OpenFOAM/containers/Bits/bitSet/bitSetI.H
+++ b/src/OpenFOAM/containers/Bits/bitSet/bitSetI.H
@@ -635,10 +635,9 @@ inline unsigned int Foam::bitSet::operator[](const label i) const
 
 inline Foam::bitSet::reference Foam::bitSet::operator[](const label i)
 {
-    // Leave enabled during testing period (MAR-2018) ... and perhaps later too
-    // #ifdef FULLDEBUG
+    #ifdef FULLDEBUG
     checkIndex(i);
-    // #endif
+    #endif
     return reference(this, i);
 }