diff --git a/build/fbcode_builder/specs/fbzmq.py b/build/fbcode_builder/specs/fbzmq.py
index f2e26d0d9..2277b7e7e 100644
--- a/build/fbcode_builder/specs/fbzmq.py
+++ b/build/fbcode_builder/specs/fbzmq.py
@@ -13,6 +13,7 @@ from shell_quoting import ShellQuoted
 
 def fbcode_builder_spec(builder):
     builder.add_option('jedisct1/libsodium:git_hash', 'stable')
+    builder.add_option('zeromq/libzmq:git_hash', 'v4.2.5')
     return {
         'depends_on': [folly, fbthrift, gmock],
         'steps': [