diff --git a/applications/test/deltaCoeffs/Test-deltaCoeffs.C b/applications/test/deltaCoeffs/Test-deltaCoeffs.C
index dcac1ebf72..8765a43e64 100644
--- a/applications/test/deltaCoeffs/Test-deltaCoeffs.C
+++ b/applications/test/deltaCoeffs/Test-deltaCoeffs.C
@@ -137,7 +137,7 @@ int main(int argc, char *argv[])
     const scalar dCRes = args.optionLookupOrDefault
     (
         "deltaCoeffResolution",
-        1
+        1.0
     );
 
     const bool readCellCentres = args.optionFound("readCellCentres");