diff --git a/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C b/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C
index e01429fc88cbea5018d7f5bcb128927df49341ea..e43dc5757fe2762dce15951679509b37e456ab48 100644
--- a/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C
+++ b/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C
@@ -25,6 +25,7 @@ License
 
 #include "OFstream.H"
 #include "IOmanip.H"
+#include "OSspecific.H"
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //