diff --git a/src/OpenFOAM/primitives/bools/bool/bool.H b/src/OpenFOAM/primitives/bools/bool/bool.H
index 2f575e717f..3ea1104b47 100644
--- a/src/OpenFOAM/primitives/bools/bool/bool.H
+++ b/src/OpenFOAM/primitives/bools/bool/bool.H
@@ -50,8 +50,14 @@ Ostream& operator<<(Ostream&, const bool);
 
 bool readBool(Istream&);
 
-} // End namespace Foam
+inline void writeEntry(Ostream& os, const bool value)
+{
+    os << value;
+}
 
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
diff --git a/src/OpenFOAM/primitives/ints/int32/int32.H b/src/OpenFOAM/primitives/ints/int32/int32.H
index 2b92a7faba..5a65c3bac2 100644
--- a/src/OpenFOAM/primitives/ints/int32/int32.H
+++ b/src/OpenFOAM/primitives/ints/int32/int32.H
@@ -72,6 +72,11 @@ Ostream& operator<<(Ostream&, const int32_t);
     Ostream& operator<<(Ostream&, const long);
 #endif
 
+inline void writeEntry(Ostream& os, const int32_t value)
+{
+    os << value;
+}
+
 
 //- Template specialization for pTraits<int32_t>
 template<>
diff --git a/src/OpenFOAM/primitives/ints/int64/int64.H b/src/OpenFOAM/primitives/ints/int64/int64.H
index 14613f0fb2..560a94b7dd 100644
--- a/src/OpenFOAM/primitives/ints/int64/int64.H
+++ b/src/OpenFOAM/primitives/ints/int64/int64.H
@@ -68,6 +68,12 @@ bool read(const char*, int64_t&);
 Istream& operator>>(Istream&, int64_t&);
 Ostream& operator<<(Ostream&, const int64_t);
 
+inline void writeEntry(Ostream& os, const int64_t value)
+{
+    os << value;
+}
+
+
 //- Template specialization for pTraits<int64_t>
 template<>
 class pTraits<int64_t>
diff --git a/src/OpenFOAM/primitives/ints/label/label.H b/src/OpenFOAM/primitives/ints/label/label.H
index 2b005f0887..739147e34a 100644
--- a/src/OpenFOAM/primitives/ints/label/label.H
+++ b/src/OpenFOAM/primitives/ints/label/label.H
@@ -66,11 +66,6 @@ inline label readLabel(Istream& is)
     return INT_SIZE(readInt,) (is);
 }
 
-inline void writeEntry(Ostream& os, const label value)
-{
-    os << value;
-}
-
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //