diff --git a/cygwin/GNUmakefile.in b/cygwin/GNUmakefile.in
index 2dd44042c2..76ce832a31 100644
--- a/cygwin/GNUmakefile.in
+++ b/cygwin/GNUmakefile.in
@@ -26,7 +26,7 @@ $(LIBRUBY): $(LIBRUBY_SO)
 $(RUBY_INSTALL_NAME).rc $(RUBYW_INSTALL_NAME).rc $(LIBRUBY_SO).rc: rbconfig.rb
 	@@MINIRUBY@ $(srcdir)/win32/resource.rb \
 	  -ruby_name=$(RUBY_INSTALL_NAME) -rubyw_name=$(RUBYW_INSTALL_NAME) \
- 	  -so_name=$(LIBRUBY_SO) \
+	  -so_name=$(LIBRUBY_SO) \
 	  . $(icondirs) $(srcdir)/win32
 
 $(PROGRAM): $(RUBY_INSTALL_NAME).res.@OBJEXT@
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 2cd964bdc1..c744554a7a 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -189,11 +189,11 @@ $(RUBY_INSTALL_NAME).rc $(RUBYW_INSTALL_NAME).rc $(LIBRUBY_SO).rc: rbconfig.rb
 .c.obj:
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
 {$(srcdir)}.c{}.obj:
- 	$(CC) -I. -I$(<D) $(CFLAGS) $(CPPFLAGS) -c $(<:/=\)
+	$(CC) -I. -I$(<D) $(CFLAGS) $(CPPFLAGS) -c $(<:/=\)
 {$(srcdir)/missing}.c{}.obj:
- 	$(CC) -I. -I$(<D) $(CFLAGS) $(CPPFLAGS) -c $(<:/=\)
+	$(CC) -I. -I$(<D) $(CFLAGS) $(CPPFLAGS) -c $(<:/=\)
 {$(srcdir)/win32}.c{}.obj:
- 	$(CC) -I. -I$(<D) $(CFLAGS) $(CPPFLAGS) -c $(<:/=\)
+	$(CC) -I. -I$(<D) $(CFLAGS) $(CPPFLAGS) -c $(<:/=\)
 
 .rc.res:
 	$(RC) -I. -I$(<D) -I$(srcdir)/win32 $(RFLAGS) -fo$@ $<