diff --git a/include/rtlibc.h b/include/rtlibc.h
index fb8c782095e0720bea2cab025795461ab9aa0f31..1dc03f350560b565b707888b7b0ed85f139d91ff 100644
--- a/include/rtlibc.h
+++ b/include/rtlibc.h
@@ -18,7 +18,9 @@
 #include "libc/libc_fcntl.h"
 #include "libc/libc_ioctl.h"
 #include "libc/libc_dirent.h"
+#ifdef RT_USING_SIGNALS
 #include "libc/libc_signal.h"
+#endif
 #include "libc/libc_fdset.h"
 #include "libc/libc_limits.h"
 #include "libc/libc_stdio.h"