diff --git a/dtool/src/dtoolutil/Sources.pp b/dtool/src/dtoolutil/Sources.pp
index cc4a575bfb..7be0aa6933 100644
--- a/dtool/src/dtoolutil/Sources.pp
+++ b/dtool/src/dtoolutil/Sources.pp
@@ -8,11 +8,12 @@
     executionEnvironment.h filename.I filename.cxx filename.h		\
     load_dso.cxx load_dso.h dSearchPath.I dSearchPath.cxx		\
     dSearchPath.h pfstream.h vector_string.cxx vector_string.h	        \
-    gnu_getopt.c gnu_getopt.h gnu_getopt1.c
+    gnu_getopt.c gnu_getopt.h gnu_getopt1.c pfstreamBuf.h pfstreamBuf.cxx
 
   #define INSTALL_HEADERS \
     executionEnvironment.I executionEnvironment.h filename.I	\
     filename.h load_dso.h dSearchPath.I dSearchPath.h	\
-    vector_string.h gnu_getopt.h
+    pfstream.h pfstream.I vector_string.h gnu_getopt.h \
+    pfstreamBuf.h
 
 #end lib_target