diff --git a/include/delaunator.hpp b/include/delaunator.hpp
index 6bc5221..15fb357 100644
--- a/include/delaunator.hpp
+++ b/include/delaunator.hpp
@@ -204,7 +204,7 @@ class Delaunator {
     void link(std::size_t a, std::size_t b);
 };
 
-Delaunator::Delaunator(std::vector<double> const& in_coords)
+inline Delaunator::Delaunator(std::vector<double> const& in_coords)
     : coords(in_coords),
       triangles(),
       halfedges(),
@@ -427,7 +427,7 @@ Delaunator::Delaunator(std::vector<double> const& in_coords)
     }
 }
 
-double Delaunator::get_hull_area() {
+inline double Delaunator::get_hull_area() {
     std::vector<double> hull_area;
     size_t e = hull_start;
     do {
@@ -437,7 +437,7 @@ double Delaunator::get_hull_area() {
     return sum(hull_area);
 }
 
-std::size_t Delaunator::legalize(std::size_t a) {
+inline std::size_t Delaunator::legalize(std::size_t a) {
     std::size_t i = 0;
     std::size_t ar = 0;
     m_edge_stack.clear();
@@ -544,7 +544,7 @@ inline std::size_t Delaunator::hash_key(const double x, const double y) const {
         m_hash_size);
 }
 
-std::size_t Delaunator::add_triangle(
+inline std::size_t Delaunator::add_triangle(
     std::size_t i0,
     std::size_t i1,
     std::size_t i2,
@@ -561,7 +561,7 @@ std::size_t Delaunator::add_triangle(
     return t;
 }
 
-void Delaunator::link(const std::size_t a, const std::size_t b) {
+inline void Delaunator::link(const std::size_t a, const std::size_t b) {
     std::size_t s = halfedges.size();
     if (a == s) {
         halfedges.push_back(b);