diff --git a/src/Lib/terragear/tg_unique_geod.hxx b/src/Lib/terragear/tg_unique_geod.hxx
index 3f14a0a5..095a7bd0 100644
--- a/src/Lib/terragear/tg_unique_geod.hxx
+++ b/src/Lib/terragear/tg_unique_geod.hxx
@@ -84,7 +84,7 @@ inline bool operator == (const SGGeodIndex& a, const SGGeodIndex& b) {
             ( fabs(a.geod.getLatitudeDeg()  - b.geod.getLatitudeDeg()) < PROXIMITY_EPSILON ));
 }
 
-struct SGGeodIndexHash : std::unary_function<SGGeodIndex, std::size_t>
+struct SGGeodIndexHash
 {
     std::size_t operator()(SGGeodIndex const& gi) const {
         return gi.GetHash();
diff --git a/src/Lib/terragear/tg_unique_tgnode.hxx b/src/Lib/terragear/tg_unique_tgnode.hxx
index 92268948..00680a7e 100644
--- a/src/Lib/terragear/tg_unique_tgnode.hxx
+++ b/src/Lib/terragear/tg_unique_tgnode.hxx
@@ -187,7 +187,7 @@ inline bool operator == (const TGNodeIndex& a, const TGNodeIndex& b) {
             ( fabs(a.geod.getLatitudeDeg()  - b.geod.getLatitudeDeg()) < PROXIMITY_EPSILON ));
 }
 
-struct TGNodeIndexHash : std::unary_function<TGNodeIndex, std::size_t>
+struct TGNodeIndexHash
 {
     std::size_t operator()(TGNodeIndex const& gi) const {
         return gi.GetHash();
diff --git a/src/Lib/terragear/tg_unique_vec2f.hxx b/src/Lib/terragear/tg_unique_vec2f.hxx
index cd1170b0..c27ee853 100644
--- a/src/Lib/terragear/tg_unique_vec2f.hxx
+++ b/src/Lib/terragear/tg_unique_vec2f.hxx
@@ -81,7 +81,7 @@ inline bool operator == (const SGVec2fIndex& a, const SGVec2fIndex& b) {
             ( fabs(a.vec.y() - b.vec.y()) < PROXIMITY_EPSILON ));
 }
 
-struct SGVec2fIndexHash : std::unary_function<SGVec2fIndex, std::size_t>
+struct SGVec2fIndexHash
 {
     std::size_t operator()(SGVec2fIndex const& vi) const {
         return vi.GetHash();
diff --git a/src/Lib/terragear/tg_unique_vec3d.hxx b/src/Lib/terragear/tg_unique_vec3d.hxx
index 0b1bbd84..48a36e02 100644
--- a/src/Lib/terragear/tg_unique_vec3d.hxx
+++ b/src/Lib/terragear/tg_unique_vec3d.hxx
@@ -74,7 +74,7 @@ inline bool operator == (const SGVec3dIndex& a, const SGVec3dIndex& b) {
             ( fabs(a.vec.z() - b.vec.z()) < PROXIMITY_EPSILON ));
 }
 
-struct SGVec3dIndexHash : std::unary_function<SGVec3dIndex, std::size_t>
+struct SGVec3dIndexHash
 {
     std::size_t operator()(SGVec3dIndex const& vi) const {
         return vi.GetHash();
diff --git a/src/Lib/terragear/tg_unique_vec3f.hxx b/src/Lib/terragear/tg_unique_vec3f.hxx
index e765d3df..65b19cbb 100644
--- a/src/Lib/terragear/tg_unique_vec3f.hxx
+++ b/src/Lib/terragear/tg_unique_vec3f.hxx
@@ -83,7 +83,7 @@ inline bool operator == (const SGVec3fIndex& a, const SGVec3fIndex& b) {
             ( fabs(a.vec.z() - b.vec.z()) < PROXIMITY_EPSILON ));
 }
 
-struct SGVec3fIndexHash : std::unary_function<SGVec3fIndex, std::size_t>
+struct SGVec3fIndexHash
 {
     std::size_t operator()(SGVec3fIndex const& vi) const {
         return vi.GetHash();