diff --git a/panda/src/linmath/config_linmath.h b/panda/src/linmath/config_linmath.h
index 7a8d61fab4..7d3df405a4 100644
--- a/panda/src/linmath/config_linmath.h
+++ b/panda/src/linmath/config_linmath.h
@@ -19,12 +19,13 @@
 #ifndef CONFIG_LINMATH_H
 #define CONFIG_LINMATH_H
 
-#include <pandabase.h>
-#include <notifyCategoryProxy.h>
+#include "pandabase.h"
+#include "notifyCategoryProxy.h"
 
 NotifyCategoryDecl(linmath, EXPCL_PANDA, EXPTP_PANDA);
 
 extern const bool paranoid_hpr_quat;
+extern const bool temp_hpr_fix;
 
 extern EXPCL_PANDA void init_liblinmath();