diff --git a/Makefile b/Makefile
index 88924824..027564c0 100644
--- a/Makefile
+++ b/Makefile
@@ -124,7 +124,7 @@ rgbfix: ${rgbfix_obj}
 	$Q${CC} ${REALLDFLAGS} -o $@ ${rgbfix_obj} ${REALCFLAGS} src/version.c
 
 rgbgfx: ${rgbgfx_obj}
-	$Q${CXX} ${REALLDFLAGS} ${PNGLDFLAGS} -o $@ ${rgbgfx_obj} ${REALCXXFLAGS} src/version.c ${PNGLDLIBS}
+	$Q${CXX} ${REALLDFLAGS} ${PNGLDFLAGS} -o $@ ${rgbgfx_obj} ${REALCXXFLAGS} -x c++ src/version.c ${PNGLDLIBS}
 
 # Rules to process files
 
diff --git a/include/gfx/proto_palette.hpp b/include/gfx/proto_palette.hpp
index daa4725e..1dd9c332 100644
--- a/include/gfx/proto_palette.hpp
+++ b/include/gfx/proto_palette.hpp
@@ -33,8 +33,6 @@ public:
 	};
 	ComparisonResult compare(ProtoPalette const &other) const;
 
-	ProtoPalette &operator=(ProtoPalette const &other);
-
 	size_t size() const;
 
 	decltype(_colorIndices)::const_iterator begin() const;
diff --git a/src/gfx/proto_palette.cpp b/src/gfx/proto_palette.cpp
index ae818237..5f253825 100644
--- a/src/gfx/proto_palette.cpp
+++ b/src/gfx/proto_palette.cpp
@@ -62,11 +62,6 @@ ProtoPalette::ComparisonResult ProtoPalette::compare(ProtoPalette const &other)
 	return theyBigger ? THEY_BIGGER : (weBigger ? WE_BIGGER : NEITHER);
 }
 
-ProtoPalette &ProtoPalette::operator=(ProtoPalette const &other) {
-	_colorIndices = other._colorIndices;
-	return *this;
-}
-
 size_t ProtoPalette::size() const {
 	return std::distance(begin(), end());
 }