diff --git a/src/fmri/glutils.cpp b/src/fmri/glutils.cpp
index 23b1610..34a23ee 100644
--- a/src/fmri/glutils.cpp
+++ b/src/fmri/glutils.cpp
@@ -6,7 +6,6 @@
 #include <chrono>
 #include <thread>
 #include "glutils.hpp"
-#include "Range.hpp"
 
 using namespace fmri;
 using namespace std;
@@ -21,16 +20,6 @@ static void handleGLError(GLenum error) {
     }
 }
 
-static void rescaleSubImages(vector<float>& textureBuffer, int subImages) {
-    auto cur = textureBuffer.begin();
-    const auto increment = textureBuffer.size() / subImages;
-
-    while (cur != textureBuffer.end()) {
-        rescale(cur, cur + increment, 0, 1);
-        advance(cur, increment);
-    }
-}
-
 void fmri::changeWindowSize(int w, int h)
 {
     // Prevent a divide by zero, when window is too short