diff --git a/panda/src/gobj/geomLinestripsAdjacency.cxx b/panda/src/gobj/geomLinestripsAdjacency.cxx
index b8c69fc240..11d14ab319 100644
--- a/panda/src/gobj/geomLinestripsAdjacency.cxx
+++ b/panda/src/gobj/geomLinestripsAdjacency.cxx
@@ -13,6 +13,7 @@
 
 #include "geomLinestripsAdjacency.h"
 #include "geomLines.h"
+#include "geomLinesAdjacency.h"
 #include "geomVertexRewriter.h"
 #include "pStatTimer.h"
 #include "bamReader.h"