diff --git a/devel/Makefile b/devel/Makefile
index 1ccc0d797a4e..e1a0761f30f8 100644
--- a/devel/Makefile
+++ b/devel/Makefile
@@ -6451,6 +6451,7 @@
     SUBDIR += rubygem-io-like
     SUBDIR += rubygem-io-nonblock
     SUBDIR += rubygem-io-wait
+    SUBDIR += rubygem-io-wait01
     SUBDIR += rubygem-iobuffer
     SUBDIR += rubygem-iostruct
     SUBDIR += rubygem-ipynbdiff
diff --git a/devel/rubygem-io-wait01/Makefile b/devel/rubygem-io-wait01/Makefile
new file mode 100644
index 000000000000..0f84f9a49069
--- /dev/null
+++ b/devel/rubygem-io-wait01/Makefile
@@ -0,0 +1,21 @@
+# Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
+
+PORTNAME=	io-wait
+PORTVERSION=	0.1.0
+CATEGORIES=	devel rubygems
+MASTER_SITES=	RG
+PKGNAMESUFFIX=	01
+
+MAINTAINER=	mfechner@FreeBSD.org
+COMMENT=	Wait until IO is readable or writable without blocking
+
+LICENSE=	BSD2CLAUSE RUBY
+LICENSE_COMB=	dual
+LICENSE_FILE_RUBY=	${WRKSRC}/COPYING
+
+USES=		gem
+USE_RUBY=	yes
+
+PORTSCOUT=	limit:^0\.1\.
+
+.include <bsd.port.mk>
diff --git a/devel/rubygem-io-wait01/distinfo b/devel/rubygem-io-wait01/distinfo
new file mode 100644
index 000000000000..8adb5632efbf
--- /dev/null
+++ b/devel/rubygem-io-wait01/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1644247635
+SHA256 (rubygem/io-wait-0.1.0.gem) = dc68348039bd06ecd3c59ef67a7f021206684f4bc5182df27421b0665f64f787
+SIZE (rubygem/io-wait-0.1.0.gem) = 9216
diff --git a/devel/rubygem-io-wait01/pkg-descr b/devel/rubygem-io-wait01/pkg-descr
new file mode 100644
index 000000000000..5019df9f8582
--- /dev/null
+++ b/devel/rubygem-io-wait01/pkg-descr
@@ -0,0 +1,4 @@
+io-wait provides the feature for waiting until IO is readable or writable
+without blocking.
+
+WWW: https://github.com/ruby/io-wait