diff --git a/src/finiteArea/faMatrices/faMatrix/faMatrix.C b/src/finiteArea/faMatrices/faMatrix/faMatrix.C
index dbd2d0ad2d..be37b965ac 100644
--- a/src/finiteArea/faMatrices/faMatrix/faMatrix.C
+++ b/src/finiteArea/faMatrices/faMatrix/faMatrix.C
@@ -48,7 +48,8 @@ void Foam::faMatrix<Type>::addToInternalField
     if (addr.size() != pf.size())
     {
         FatalErrorInFunction
-            << "sizes of addressing and field are different"
+            << "addressing (" << addr.size()
+            << ") and field (" << pf.size() << ") are different sizes" << endl
             << abort(FatalError);
     }
 
@@ -85,7 +86,8 @@ void Foam::faMatrix<Type>::subtractFromInternalField
     if (addr.size() != pf.size())
     {
         FatalErrorInFunction
-            << "sizes of addressing and field are different"
+            << "addressing (" << addr.size()
+            << ") and field (" << pf.size() << ") are different sizes" << endl
             << abort(FatalError);
     }
 
diff --git a/src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.C b/src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.C
index f37e025045..8b06e28126 100644
--- a/src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.C
+++ b/src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.C
@@ -49,7 +49,8 @@ void Foam::fvMatrix<Type>::addToInternalField
     if (addr.size() != pf.size())
     {
         FatalErrorInFunction
-            << "sizes of addressing and field are different"
+            << "addressing (" << addr.size()
+            << ") and field (" << pf.size() << ") are different sizes" << endl
             << abort(FatalError);
     }
 
@@ -86,7 +87,8 @@ void Foam::fvMatrix<Type>::subtractFromInternalField
     if (addr.size() != pf.size())
     {
         FatalErrorInFunction
-            << "sizes of addressing and field are different"
+            << "addressing (" << addr.size()
+            << ") and field (" << pf.size() << ") are different sizes" << endl
             << abort(FatalError);
     }