diff --git a/src/functionObjects/field/Make/files b/src/functionObjects/field/Make/files
index 060eb3e168..bd6b60b373 100644
--- a/src/functionObjects/field/Make/files
+++ b/src/functionObjects/field/Make/files
@@ -154,6 +154,6 @@ resolutionIndex/resolutionIndexModels/CelikEtaIndex/CelikEtaIndex.C
 age/age.C
 comfort/comfort.C
 
-fieldStatistics/fieldStatistics.C
+fieldStatistics/fieldStatistics.cxx
 
 LIB = $(FOAM_LIBBIN)/libfieldFunctionObjects
diff --git a/src/functionObjects/field/fieldStatistics/fieldStatistics.C b/src/functionObjects/field/fieldStatistics/fieldStatistics.cxx
similarity index 100%
rename from src/functionObjects/field/fieldStatistics/fieldStatistics.C
rename to src/functionObjects/field/fieldStatistics/fieldStatistics.cxx