diff --git a/thirdparty/rvo2/rvo2_2d/Definitions.h b/thirdparty/rvo2/rvo2_2d/Definitions.h
index 4b986fc991..a5553d8378 100644
--- a/thirdparty/rvo2/rvo2_2d/Definitions.h
+++ b/thirdparty/rvo2/rvo2_2d/Definitions.h
@@ -41,6 +41,7 @@
 #include <algorithm>
 #include <cmath>
 #include <cstddef>
+#include <cstdint>
 #include <limits>
 #include <vector>
 
diff --git a/thirdparty/rvo2/rvo2_3d/Agent3d.h b/thirdparty/rvo2/rvo2_3d/Agent3d.h
index 3e43646871..d99e3cac66 100644
--- a/thirdparty/rvo2/rvo2_3d/Agent3d.h
+++ b/thirdparty/rvo2/rvo2_3d/Agent3d.h
@@ -38,6 +38,7 @@
 #define RVO3D_AGENT_H_
 
 #include <cstddef>
+#include <cstdint>
 #include <utility>
 #include <vector>