diff --git a/src/OpenFOAM/primitives/ints/label/label.C b/src/OpenFOAM/primitives/ints/label/label.C
index 630296381..859c3a5ab 100644
--- a/src/OpenFOAM/primitives/ints/label/label.C
+++ b/src/OpenFOAM/primitives/ints/label/label.C
@@ -24,6 +24,7 @@ License
 \*---------------------------------------------------------------------------*/
 
 #include "label.H"
+#include "error.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //