diff --git a/cf/roken-frag.m4 b/cf/roken-frag.m4
index 5c82d27ee..0001b9211 100644
--- a/cf/roken-frag.m4
+++ b/cf/roken-frag.m4
@@ -72,6 +72,7 @@ AC_CHECK_HEADERS([\
 	shadow.h				\
 	stdint.h				\
 	sys/bswap.h				\
+	sys/errno.h				\
 	sys/ioctl.h				\
 	sys/mman.h				\
 	sys/param.h				\
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index aee665292..cc5e827cc 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -182,6 +182,9 @@ struct sockaddr_dl;
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
+#ifdef HAVE_SYS_ERRNO_H
+#include <sys/errno.h>
+#endif
 #ifdef HAVE_SYS_BITYPES_H
 #include <sys/bitypes.h>
 #endif