diff --git a/src/OpenFOAM/dimensionSet/dimensionSet.H b/src/OpenFOAM/dimensionSet/dimensionSet.H
index 891102e59f..5302423634 100644
--- a/src/OpenFOAM/dimensionSet/dimensionSet.H
+++ b/src/OpenFOAM/dimensionSet/dimensionSet.H
@@ -173,7 +173,7 @@ public:
 
     // Constructors
 
-        //- Construct null (dimensionless).
+        //- Default construct (dimensionless).
         dimensionSet();
 
         //- Construct from exponents for the first five or all seven dimensions
diff --git a/src/OpenFOAM/dimensionSet/dimensionSetIO.C b/src/OpenFOAM/dimensionSet/dimensionSetIO.C
index b15fafe990..d978ad90b7 100644
--- a/src/OpenFOAM/dimensionSet/dimensionSetIO.C
+++ b/src/OpenFOAM/dimensionSet/dimensionSetIO.C
@@ -35,7 +35,7 @@ License
 
 Foam::dimensionSet::dimensionSet(const dictionary& dict, const word& entryName)
 {
-    const entry& e = dict.lookupEntry(entryName, keyType::REGEX);
+    const entry& e = dict.lookupEntry(entryName, keyType::LITERAL);
     ITstream& is = e.stream();
 
     is >> *this;