diff --git a/panda/src/physics/linearForce.cxx b/panda/src/physics/linearForce.cxx
index f25da6a934..c731054c97 100644
--- a/panda/src/physics/linearForce.cxx
+++ b/panda/src/physics/linearForce.cxx
@@ -16,10 +16,10 @@
 //
 ////////////////////////////////////////////////////////////////////
 
-#include <datagram.h>
-#include <datagramIterator.h>
-#include <bamReader.h>
-#include <bamWriter.h>
+#include "datagram.h"
+#include "datagramIterator.h"
+#include "bamReader.h"
+#include "bamWriter.h"
 
 #include "linearForce.h"