diff --git a/libc-test/semver/solarish.txt b/libc-test/semver/solarish.txt
new file mode 100644
index 000000000000..069508925c8e
--- /dev/null
+++ b/libc-test/semver/solarish.txt
@@ -0,0 +1 @@
+PIPE_BUF
diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index ced5827cb192..6fd0e6e4ce44 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -1265,6 +1265,7 @@ pub const FOPEN_MAX: ::c_uint = 20;
 pub const FILENAME_MAX: ::c_uint = 1024;
 pub const L_tmpnam: ::c_uint = 25;
 pub const TMP_MAX: ::c_uint = 17576;
+pub const PIPE_BUF: ::c_int = 5120;
 
 pub const GRND_NONBLOCK: ::c_uint = 0x0001;
 pub const GRND_RANDOM: ::c_uint = 0x0002;