diff --git a/direct/src/dcparser/dcParser.cxx.prebuilt b/direct/src/dcparser/dcParser.cxx.prebuilt
index 6f4f167302..aeab2dc34c 100644
--- a/direct/src/dcparser/dcParser.cxx.prebuilt
+++ b/direct/src/dcparser/dcParser.cxx.prebuilt
@@ -179,7 +179,7 @@ dc_cleanup_parser() {
 #  endif
 # endif
 
-#include "dcParser.yxx.h"
+#include "dcParser.h"
 /* Symbol kind.  */
 enum yysymbol_kind_t
 {
diff --git a/makepanda/makepanda.py b/makepanda/makepanda.py
index d5040c9049..a0d50d60b1 100755
--- a/makepanda/makepanda.py
+++ b/makepanda/makepanda.py
@@ -1571,9 +1571,9 @@ def CompileBison(wobj, wsrc, opts):
         else:
             exit('Could not find bison!')
     else:
-        oscmd(bison + ' -y -d -o'+GetOutputDir()+'/tmp/'+ifile+'.c -p '+pre+' '+wsrc)
-        CopyFile(wdstc, GetOutputDir()+"/tmp/"+ifile+".c")
-        CopyFile(wdsth, GetOutputDir()+"/tmp/"+ifile+".h")
+        oscmd(bison + ' -y -d -o'+GetOutputDir()+'/tmp/'+ifile[:-4]+'.c -p '+pre+' '+wsrc)
+        CopyFile(wdstc, GetOutputDir()+"/tmp/"+ifile[:-4]+".c")
+        CopyFile(wdsth, GetOutputDir()+"/tmp/"+ifile[:-4]+".h")
 
     # Finally, compile the generated source file.
     CompileCxx(wobj, wdstc, opts + ["FLEX"])
diff --git a/panda/src/egg/parser.cxx.prebuilt b/panda/src/egg/parser.cxx.prebuilt
index c926fcbc45..7a4e38db41 100644
--- a/panda/src/egg/parser.cxx.prebuilt
+++ b/panda/src/egg/parser.cxx.prebuilt
@@ -253,7 +253,7 @@ eggyywarning(YYLTYPE *loc, EggParserState &state, yyscan_t scanner, const string
 #  endif
 # endif
 
-#include "parser.yxx.h"
+#include "parser.h"
 /* Symbol kind.  */
 enum yysymbol_kind_t
 {