diff --git a/.gitignore b/.gitignore
index c6483dbc3..59f6f6d27 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,6 @@ ipch/
 *.user
 *.userosscache
 *.sln.docstates
+
+# macOS XCode build cache
+deps/libuv/build/XCBuildData/
diff --git a/.travis.yml b/.travis.yml
index dab7dee38..a004f1026 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ compiler:
   - gcc
   - clang
 env:
-  - WREN_OPTIONS="" CI_ARCHS="ci_32 ci_64"
+  - WREN_OPTIONS="" CI_ARCHS="ci_64"
   - WREN_OPTIONS="-DWREN_NAN_TAGGING=0" CI_ARCHS="ci_64"
 
 # Automatically build and deploy docs.
diff --git a/util/build_libuv.py b/util/build_libuv.py
index b6152f717..65f1f9e24 100755
--- a/util/build_libuv.py
+++ b/util/build_libuv.py
@@ -26,7 +26,7 @@ def build_libuv_mac():
   run([
     "xcodebuild",
     # Build a 32-bit + 64-bit universal binary:
-    "ARCHS=i386 x86_64", "ONLY_ACTIVE_ARCH=NO",
+    "ARCHS=x86_64", "ONLY_ACTIVE_ARCH=NO",
     "BUILD_DIR=out",
     "-project", LIB_UV_DIR + "/uv.xcodeproj",
     "-configuration", "Release",