diff --git a/doc/FAQ/Makefile b/doc/FAQ/Makefile
index 484d0aec9a..8a4a02f0fb 100644
--- a/doc/FAQ/Makefile
+++ b/doc/FAQ/Makefile
@@ -55,7 +55,7 @@ html: dirs $(FILES)
  	    $(PROJECT).texi
 
 clean:
-	rm -f *.o $(PROG) *.txt core *.pdf
+	rm -f *.o $(PROG) *.txt core $(PROJECT).pdf
 	rm -f *.dvi *.ps *.log *.aux *.cp *.fn *.ky *.pg *.toc *.tp *.vr $(BASE)
 	rm -f $(PROJECT) $(PROJECT)-* $(GENERATED_FILES)
 	rm -f *.fixed _* 
diff --git a/doc/bsp_howto/Makefile b/doc/bsp_howto/Makefile
index 676f18afdf..5ed8ea0051 100644
--- a/doc/bsp_howto/Makefile
+++ b/doc/bsp_howto/Makefile
@@ -56,7 +56,7 @@ html: dirs $(FILES)
  	    $(PROJECT).texi
 
 clean:
-	rm -f *.o $(PROG) *.txt core *.pdf
+	rm -f *.o $(PROG) *.txt core $(PROJECT).pdf
 	rm -f *.dvi *.ps *.log *.aux *.cp *.fn *.ky *.pg *.toc *.tp *.vr $(BASE)
 	rm -f $(PROJECT) $(PROJECT)-* $(GENERATED_FILES)
 	rm -f *.fixed _* network.t
diff --git a/doc/develenv/Makefile b/doc/develenv/Makefile
index 7cdc3a71bc..008fde05e1 100644
--- a/doc/develenv/Makefile
+++ b/doc/develenv/Makefile
@@ -47,7 +47,7 @@ html: dirs
  	    $(PROJECT).texi
 
 clean:
-	rm -f *.o $(PROG) *.txt core *.html *.pdf
+	rm -f *.o $(PROG) *.txt core *.html $(PROJECT).pdf
 	rm -f *.dvi *.ps *.log *.aux *.cp *.fn *.ky *.pg *.toc *.tp *.vr $(BASE)
 	rm -f $(PROJECT) $(PROJECT)-* _*