diff --git a/direct/src/interval/Sources.pp b/direct/src/interval/Sources.pp
index 7866a4802d..f400433572 100644
--- a/direct/src/interval/Sources.pp
+++ b/direct/src/interval/Sources.pp
@@ -32,7 +32,8 @@
     cMetaInterval.I cMetaInterval.h \
     hideInterval.I hideInterval.h \
     showInterval.I showInterval.h \
-    waitInterval.I waitInterval.h
+    waitInterval.I waitInterval.h \
+    lerp_helpers.h
 
   #define IGATESCAN all
 #end lib_target
diff --git a/direct/src/interval/lerp_helpers.h b/direct/src/interval/lerp_helpers.h
index 8b55482406..579257b215 100644
--- a/direct/src/interval/lerp_helpers.h
+++ b/direct/src/interval/lerp_helpers.h
@@ -21,11 +21,6 @@
 
 #include "directbase.h"
 
-//
-// This header file is only included within .cxx files in this
-// directory.
-//
-
 //
 // The functions defined here include some trivial template functions
 // for handling basic lerp computations, common to several .cxx files