diff --git a/applications/utilities/postProcessing/noise/noise.C b/applications/utilities/postProcessing/noise/noise.C
index ac294d4dc1..88ef922589 100644
--- a/applications/utilities/postProcessing/noise/noise.C
+++ b/applications/utilities/postProcessing/noise/noise.C
@@ -116,7 +116,7 @@ int main(int argc, char *argv[])
     (
         IOobject
         (
-            dictName,
+            dictName.expand(),
             runTime,
             IOobject::MUST_READ
         )
diff --git a/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.C b/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.C
index 92a3df57fd..860aafdae3 100644
--- a/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.C
+++ b/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.C
@@ -46,6 +46,11 @@ addToRunTimeSelectionTable(noiseModel, surfaceNoise, dictionary);
 
 void surfaceNoise::initialise(const dictionary& dict)
 {
+    dict.lookup("inputFile") >> inputFileName_;
+    inputFileName_.expand();
+
+    dict.readIfPresent("fftWriteInterval", fftWriteInterval_);
+
     label nAvailableTimes = 0;
 
     // All reading performed on the master processor only
@@ -418,13 +423,13 @@ Foam::scalar surfaceNoise::surfaceAverage
 surfaceNoise::surfaceNoise(const dictionary& dict)
 :
     noiseModel(dict),
-    inputFileName_(dict.lookup("inputFile")),
+    inputFileName_("unknown-inputFile"),
     pIndex_(0),
     times_(),
     deltaT_(0),
     startTimeIndex_(0),
     nFace_(0),
-    fftWriteInterval_(dict.lookupOrDefault("fftWriteInterval", 1))
+    fftWriteInterval_(1)
 {
     initialise(dict);
 }
diff --git a/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.H b/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.H
index 1ba1772df4..054944a158 100644
--- a/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.H
+++ b/src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.H
@@ -116,7 +116,7 @@ protected:
     // Protected Data
 
         //- Input file name
-        const fileName inputFileName_;
+        fileName inputFileName_;
 
         //- Index of pressure field in reader field list
         label pIndex_;