diff --git a/src/Libpfs/manip/gamma_levels.cpp b/src/Libpfs/manip/gamma_levels.cpp
index 67975111..c0fb1798 100644
--- a/src/Libpfs/manip/gamma_levels.cpp
+++ b/src/Libpfs/manip/gamma_levels.cpp
@@ -31,13 +31,6 @@
 
 namespace {
 
-template <typename T>
-inline T clamp(const T &v, const T &lower_bound, const T &upper_bound) {
-    if (v <= lower_bound) return lower_bound;
-    if (v >= upper_bound) return upper_bound;
-    return v;
-}
-
 ////! \note I assume that *in* contains only value between [0,1]
 // void gamma_levels_array(const pfs::Array2D* in, pfs::Array2D* out,
 //                        float black_in, float white_in,