diff --git a/ReactCommon/cxxreact/JSBigString.cpp b/ReactCommon/cxxreact/JSBigString.cpp
index dc997d1cd5..d841295e32 100644
--- a/ReactCommon/cxxreact/JSBigString.cpp
+++ b/ReactCommon/cxxreact/JSBigString.cpp
@@ -7,6 +7,7 @@
 
 #include <fcntl.h>
 #include <sys/stat.h>
+#include <unistd.h>
 
 #include <glog/logging.h>
 
diff --git a/ReactCommon/cxxreact/JSBigString.h b/ReactCommon/cxxreact/JSBigString.h
index c4bf86fd71..3d07f1fda4 100644
--- a/ReactCommon/cxxreact/JSBigString.h
+++ b/ReactCommon/cxxreact/JSBigString.h
@@ -6,7 +6,6 @@
 #pragma once
 
 #include <fcntl.h>
-#include <unistd.h>
 #include <sys/mman.h>
 
 #include <folly/Exception.h>