diff --git a/configure.in b/configure.in
index b48490a9b..644844ea0 100644
--- a/configure.in
+++ b/configure.in
@@ -279,6 +279,7 @@ AC_CHECK_HEADERS([\
 	siad.h					\
 	signal.h				\
 	stropts.h				\
+	strings.h				\
 	sys/bitypes.h				\
 	sys/category.h				\
 	sys/file.h				\