diff --git a/classpath/java-lang.cpp b/classpath/java-lang.cpp
index c5cd630fbf..bb087560fe 100644
--- a/classpath/java-lang.cpp
+++ b/classpath/java-lang.cpp
@@ -51,7 +51,9 @@
 #  endif
 #  include "unistd.h"
 #  include "limits.h"
+#  include "signal.h"
 #  include "sys/time.h"
+#  include "sys/types.h"
 #  include "sys/sysctl.h"
 #  include "sys/utsname.h"
 #  include "sys/wait.h"