diff --git a/panda/src/pipeline/lightMutexDirect.h b/panda/src/pipeline/lightMutexDirect.h
index 19b6d46a9e..b145661604 100644
--- a/panda/src/pipeline/lightMutexDirect.h
+++ b/panda/src/pipeline/lightMutexDirect.h
@@ -17,6 +17,7 @@
 
 #include "pandabase.h"
 #include "mutexImpl.h"
+#include "pnotify.h"
 
 class Thread;
 
diff --git a/panda/src/pipeline/psemaphore.h b/panda/src/pipeline/psemaphore.h
index 8fe89a0d82..5c8e58cc18 100644
--- a/panda/src/pipeline/psemaphore.h
+++ b/panda/src/pipeline/psemaphore.h
@@ -18,6 +18,7 @@
 #include "pandabase.h"
 #include "pmutex.h"
 #include "conditionVar.h"
+#include "mutexHolder.h"
 
 ////////////////////////////////////////////////////////////////////
 //       Class : Semaphore
diff --git a/panda/src/pipeline/threadPriority.cxx b/panda/src/pipeline/threadPriority.cxx
index b4b565f673..b1746c442a 100644
--- a/panda/src/pipeline/threadPriority.cxx
+++ b/panda/src/pipeline/threadPriority.cxx
@@ -13,6 +13,8 @@
 ////////////////////////////////////////////////////////////////////
 
 #include "threadPriority.h"
+#include "pnotify.h" // nassertr
+#include "pipeline.h"
 
 ostream &
 operator << (ostream &out, ThreadPriority pri) {