diff --git a/Makefile.am b/Makefile.am
index aab6b0c8..8d5e68b5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -390,6 +390,8 @@ libuv_la_CFLAGS += -D_UNIX03_THREADS \
                    -qXPLINK \
                    -qFLOAT=IEEE
 libuv_la_LDFLAGS += -qXPLINK
+libuv_la_SOURCES += src/unix/pthread-fixes.c \
+                    src/unix/pthread-barrier.c
 endif
 
 if HAVE_PKG_CONFIG
diff --git a/uv.gyp b/uv.gyp
index 3a480dea..a2edc9ec 100644
--- a/uv.gyp
+++ b/uv.gyp
@@ -302,6 +302,12 @@
         ['uv_library=="shared_library"', {
           'defines': [ 'BUILDING_UV_SHARED=1' ]
         }],
+        ['OS=="zos"', {
+          'sources': [
+            'src/unix/pthread-fixes.c',
+            'src/unix/pthread-barrier.c'
+          ]
+        }],
       ]
     },