diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc820fb6..7173420d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -205,7 +205,7 @@ fityk/data.cpp       fityk/lexer.cpp      fityk/runner.cpp     fityk/vm.cpp
 fityk/eparser.cpp    fityk/LMfit.cpp      fityk/settings.cpp   fityk/voigt.cpp
 fityk/f_fcjasym.cpp  fityk/logic.cpp      fityk/tplate.cpp
 fityk/fit.cpp        fityk/luabridge.cpp  fityk/transform.cpp
-fityk/cmpfit/mpfit.c
+fityk/cmpfit/mpfit.c fityk/root/background.cpp
 ${lua_runtime} ${lua_cxx})
 
 if (DOWNLOAD_XYLIB)
diff --git a/fityk/root/background.cpp b/fityk/root/background.cpp
index f18bb323..563aed6d 100644
--- a/fityk/root/background.cpp
+++ b/fityk/root/background.cpp
@@ -453,7 +453,7 @@ std::vector<fityk::Point> ROOT::background(const std::vector<fityk::Point> spect
     int i, j, w, bw, b1, b2, priz;
     double a, b, c, d, e, yb1, yb2, ai, av, men, b4, c4, d4, e4, b6, c6, d6, e6, f6, g6, b8, c8, d8, e8, f8, g8, h8, i8;
 
-    const unsigned int ssize = spectrum.size();
+    const int ssize = (int) spectrum.size();
 
     if (ssize <= 0)
         throw fityk::ExecuteError("Wrong vector size");
diff --git a/fityk/transform.cpp b/fityk/transform.cpp
index ce4f0ce7..168e06cb 100644
--- a/fityk/transform.cpp
+++ b/fityk/transform.cpp
@@ -109,7 +109,7 @@ struct vector_slice {
 // It returns the iterators to the begin of the active
 // slice (first active datapoint) and to the end of the
 // slice (datapoint *after* the last active one).
-struct vector_slice<Point> first_active_slice(const vector<Point> &pp,
+struct vector_slice<Point> first_active_slice(const vector<Point> &/*pp*/,
                                               vector<Point>::iterator begin,
                                               vector<Point>::iterator end)
 {