diff --git a/packages/react-native/sdks/hermes-engine/utils/build-hermesc-xcode.sh b/packages/react-native/sdks/hermes-engine/utils/build-hermesc-xcode.sh
index c777b0557cb943..132ee54c734566 100755
--- a/packages/react-native/sdks/hermes-engine/utils/build-hermesc-xcode.sh
+++ b/packages/react-native/sdks/hermes-engine/utils/build-hermesc-xcode.sh
@@ -4,27 +4,15 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-set -x
+set -x -e
 
 hermesc_dir_path="$1"; shift
 jsi_path="$1"
 
 # This script is supposed to be executed from Xcode "run script" phase.
-# Xcode sets up its build environment based on the build target.
-# Here we override relevant envvars to make sure that we build hermesc for macosx,
-# even if Xcode build target is iphone, iponesimulator, etc.
-MACOSX_DEPLOYMENT_TARGET=$(sw_vers -productVersion)
-export MACOSX_DEPLOYMENT_TARGET=$MACOSX_DEPLOYMENT_TARGET
+# Xcode sets up its build environment based on the build target (iphone, iphonesimulator, macodsx).
+# We want to make sure that hermesc is built for mac.
+# So we clean the environment with env -i, and explicitly set SDKROOT to macosx
 SDKROOT=$(xcode-select -p)/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
-export SDKROOT=$SDKROOT
-
-if ! "$CMAKE_BINARY" -S "${PODS_ROOT}/hermes-engine" -B "$hermesc_dir_path" -DJSI_DIR="$jsi_path"
-then
-    echo "Failed to configure Hermesc cmake project."
-    exit 1
-fi
-if ! "$CMAKE_BINARY" --build "$hermesc_dir_path" --target hermesc -j "$(sysctl -n hw.ncpu)"
-then
-    echo "Failed to build Hermesc cmake project."
-    exit 1
-fi
+env -i SDKROOT="$SDKROOT" "$CMAKE_BINARY" -S "${PODS_ROOT}/hermes-engine" -B "$hermesc_dir_path" -DJSI_DIR="$jsi_path"
+env -i SDKROOT="$SDKROOT" "$CMAKE_BINARY" --build "$hermesc_dir_path" --target hermesc -j "$(sysctl -n hw.ncpu)"