diff --git a/Makefile.in b/Makefile.in
index 4d71b4eaed1c330ce7a499a25715deb021c15681..73a9c58d0e7ee1f25fc3780150942f4080dd4e2e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -12,7 +12,7 @@ all:
 	
 clean:
 	for i in ${dirs};  do cd $$i; make clean; cd ..; done
-	rm $(prefix)/bin/callbacks.exe
+	rm -f $(prefix)/bin/callbacks.exe
 
 install: all
 	cp lib/callbacks.exe $(prefix)/bin/callbacks.exe
diff --git a/p1/Makefile.in b/p1/Makefile.in
index a203903cbb810a9770416a8e47f9582b6289e714..f1ecc268804e8250a1b69218fc97fe76a200a1e9 100644
--- a/p1/Makefile.in
+++ b/p1/Makefile.in
@@ -23,6 +23,6 @@ all: 	$(OBJS)
 	$(AR) -r $(LIB) $(OBJS)
 
 clean:
-	rm *.o
+	rm -f *.o