diff --git a/Framework/CurveFitting/inc/MantidCurveFitting/Algorithms/FitPowderDiffPeaks.h b/Framework/CurveFitting/inc/MantidCurveFitting/Algorithms/FitPowderDiffPeaks.h
index 5c1513137cd1ccf9e27f8eb9c96416c900364975..dccb211641bea2bfbb776910e3f3c4b493775572 100644
--- a/Framework/CurveFitting/inc/MantidCurveFitting/Algorithms/FitPowderDiffPeaks.h
+++ b/Framework/CurveFitting/inc/MantidCurveFitting/Algorithms/FitPowderDiffPeaks.h
@@ -123,7 +123,7 @@ private:
 
   /// Fit single peak in robust mode (no hint)
   bool fitSinglePeakRobust(Functions::BackToBackExponential_sptr peak,
-                           Functions::BackgroundFunction_sptr background,
+                           Functions::BackgroundFunction_sptr backgroundfunction,
                            double leftdev, double rightdev,
                            std::map<std::string, double> rightpeakparammap,
                            double &finalchi2);
diff --git a/Framework/CurveFitting/src/Algorithms/FitPowderDiffPeaks.cpp b/Framework/CurveFitting/src/Algorithms/FitPowderDiffPeaks.cpp
index d83a59efd55ac4d7f8757431e29a10ba16dde5b7..b69b92fdba2ae6bc11c07eaadbd5e5c46d75924d 100644
--- a/Framework/CurveFitting/src/Algorithms/FitPowderDiffPeaks.cpp
+++ b/Framework/CurveFitting/src/Algorithms/FitPowderDiffPeaks.cpp
@@ -593,7 +593,7 @@ void FitPowderDiffPeaks::observePeakRange(BackToBackExponential_sptr thispeak,
   * Assumption:
   * 1. peak must be in the range of [input peak center - leftdev, + rightdev]
   *
-  * Prerequisit:
+  * Prerequisites:
   * ---- NONE!
   *
   * Algorithms: