diff --git a/panda/src/collide/collisionInvSphere.cxx b/panda/src/collide/collisionInvSphere.cxx
index 1428078d09..ada39574c3 100644
--- a/panda/src/collide/collisionInvSphere.cxx
+++ b/panda/src/collide/collisionInvSphere.cxx
@@ -12,7 +12,9 @@
  */
 
 #include "collisionInvSphere.h"
+
 #include "collisionSphere.h"
+#include "collisionCapsule.h"
 #include "collisionLine.h"
 #include "collisionRay.h"
 #include "collisionSegment.h"
diff --git a/panda/src/collide/collisionPolygon.cxx b/panda/src/collide/collisionPolygon.cxx
index 0c467c1d4c..c4f6b4e7bb 100644
--- a/panda/src/collide/collisionPolygon.cxx
+++ b/panda/src/collide/collisionPolygon.cxx
@@ -12,9 +12,11 @@
  */
 
 #include "collisionPolygon.h"
+
 #include "collisionHandler.h"
 #include "collisionEntry.h"
 #include "collisionSphere.h"
+#include "collisionCapsule.h"
 #include "collisionLine.h"
 #include "collisionRay.h"
 #include "collisionSegment.h"