diff --git a/panda/src/glstuff/Sources.pp b/panda/src/glstuff/Sources.pp
index afe36d0021..6860b381c5 100644
--- a/panda/src/glstuff/Sources.pp
+++ b/panda/src/glstuff/Sources.pp
@@ -22,6 +22,9 @@
      glGraphicsStateGuardian_src.I \
      glGraphicsStateGuardian_src.cxx \
      glGraphicsStateGuardian_src.h \
+     glGraphicsBuffer_src.I \
+     glGraphicsBuffer_src.cxx \
+     glGraphicsBuffer_src.h \
      glImmediateModeSender_src.I \
      glImmediateModeSender_src.cxx \
      glImmediateModeSender_src.h \