diff --git a/colour.cpp b/colour.cpp
index c871fb23..46ff2e28 100644
--- a/colour.cpp
+++ b/colour.cpp
@@ -35,7 +35,7 @@ colour::operator*= (double v) {
 
 
 const json::node&
-operator>> (const json::node &node, colour &c) {
+util::operator>> (const json::node &node, colour &c) {
     c.red   = node[0].as_number ();
     c.green = node[1].as_number ();
     c.blue  = node[2].as_number ();
@@ -68,7 +68,7 @@ namespace util {
 
 
 std::ostream&
-operator<< (std::ostream &os, const util::colour &c) {
+util::operator<< (std::ostream &os, const util::colour &c) {
     os << "colour(" << c.red << ", " << c.green << ", " << c.blue << ", " << c.alpha << ")";
     return os;
 }
diff --git a/colour.hpp b/colour.hpp
index a2d055aa..227a1174 100644
--- a/colour.hpp
+++ b/colour.hpp
@@ -37,9 +37,10 @@ namespace util {
 
     template <> colour& randomise (colour&);
     template <> colour& random    (void);
+
+    std::ostream& operator<< (std::ostream&, const util::colour&);
+    const json::node& operator>> (const json::node&, util::colour&);
 }
 
-std::ostream& operator<< (std::ostream&, const util::colour&);
-const json::node& operator>> (const json::node&, util::colour&);
 
 #endif
diff --git a/json/validate.cpp b/json/validate.cpp
index e383ce29..d0d19616 100644
--- a/json/validate.cpp
+++ b/json/validate.cpp
@@ -25,7 +25,7 @@ main (int argc, char ** argv) {
     try {
        json::parse (boost::filesystem::path (argv[ARG_PATH]));
     } catch (json::error &x) {
-        std::cerr << x.what () << std::endl;
+        std::cerr << "Error: " << x.what () << std::endl;
         return EXIT_FAILURE;
     }
 
diff --git a/vector.cpp b/vector.cpp
index f7223e14..de9bbc1b 100644
--- a/vector.cpp
+++ b/vector.cpp
@@ -193,19 +193,19 @@ vector::sanity (void) const {
 
 
 util::vector
-operator* (double a, const util::vector &b)
+util::operator* (double a, const util::vector &b)
     { return b * a; }
 
 
 std::ostream&
-operator<< (std::ostream &os, const util::vector &v) {
+util::operator<< (std::ostream &os, const util::vector &v) {
     os << "vec(" << v.x << ", " << v.y << ", " << v.z << ")";
     return os;
 }
 
 
 const json::node&
-operator>> (const json::node &node, util::vector &v) {
+util::operator>> (const json::node &node, util::vector &v) {
     v.x = node[0].as_number ();
     v.y = node[1].as_number ();
     v.z = node[2].as_number ();
diff --git a/vector.hpp b/vector.hpp
index 0f2cbf32..26cbdd69 100644
--- a/vector.hpp
+++ b/vector.hpp
@@ -58,11 +58,14 @@ namespace util {
 
         void sanity (void) const;
     };
+
+    util::vector operator* (double, const util::vector&);
+
+    std::ostream& operator<< (std::ostream&, const util::vector&);
+    const json::node& operator>> (const json::node&, util::vector&);
+
 }
 
-util::vector operator* (double, const util::vector&);
 
-std::ostream& operator<< (std::ostream&, const util::vector&);
-const json::node& operator>> (const json::node&, util::vector&);
 #endif