diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 999ffaa379..533f3f85ce 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2306,7 +2306,7 @@ CLEANOBJS     = *.#{$OBJEXT} #{config_string('cleanobjs') {|t| t.gsub(/\$\*/, "$
     mfile.puts(conf)
     mfile.print "
 all:    #{$extout ? "install" : target ? "$(DLLIB)" : "Makefile"}
-static: #{$extmk && !$static ? "all" : "$(STATIC_LIB)#{!$extmk ? " install-rb" : ""}"}
+static: #{$extmk && !$static ? "all" : "$(STATIC_LIB)#{$extout ? " install-rb" : ""}"}
 .PHONY: all install static install-so install-rb
 .PHONY: clean clean-so clean-static clean-rb
 " #"
diff --git a/version.h b/version.h
index 3c9e9e34f7..49fd4b9a6e 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.4.2"
 #define RUBY_RELEASE_DATE "2017-07-23"
-#define RUBY_PATCHLEVEL 153
+#define RUBY_PATCHLEVEL 154
 
 #define RUBY_RELEASE_YEAR 2017
 #define RUBY_RELEASE_MONTH 7