diff --git a/make-common.sh b/make-common.sh
index 4fd0ae97..f41328a5 100755
--- a/make-common.sh
+++ b/make-common.sh
@@ -1,7 +1,7 @@
 BUILDTYPE='Release'
 
-# on MacOS, build universal binaries by default
-ARCH='i386;x86_64'
+# on MacOS, do not build universal binaries by default
+ARCH=''
 
 # by default we do NOT build 32bit on 64bit system
 LLVM_BUILD_32_BITS=0
@@ -24,6 +24,9 @@ while [ "$1" != "" ]; do
     macos-no-universal)
       ARCH=''	# do not build MacOS universal binaries
       ;;
+    macos-universal)
+      ARCH='i386;x86_64'	# build MacOS universal binaries
+      ;;
     *)
       echo "ERROR: unknown parameter \"$1\""
       usage
diff --git a/make-lib.sh b/make-lib.sh
index 41b2c41e..f7d290d6 100755
--- a/make-lib.sh
+++ b/make-lib.sh
@@ -1,7 +1,7 @@
 #!/bin/sh -e
 
 # Build static library of Keystone Engine
-# syntax: make-lib.sh [debug] [macos-no-universal] [lib32] [lib_only]
+# syntax: make-lib.sh [debug] [macos-universal|macos-no-universal] [lib32] [lib_only]
 
 usage()
 {
@@ -9,7 +9,8 @@ usage()
   echo "Syntax:  make-lib.sh [debug] [macos-universal] [lib64]"
   echo ""
   echo "         debug: build with debug info"
-  echo "         macos-no-universal: do not build MacOS universal binaries"
+  echo "         macos-universal: build MacOS universal binaries"
+  echo "         macos-no-universal: do not build MacOS universal binaries (default)"
   echo "         lib_only: skip kstool & only build libraries"
   echo "         lib32: build 32bit libraries on 64bit system"
   echo ""
diff --git a/make-share.sh b/make-share.sh
index 87a02ade..a16ce110 100755
--- a/make-share.sh
+++ b/make-share.sh
@@ -1,7 +1,7 @@
 #!/bin/sh -e
 
 # Build shared library of Keystone Engine
-# syntax: make-share.sh [debug] [macos-no-universal] [lib32] [lib_only]
+# syntax: make-share.sh [debug] [macos-universal|macos-no-universal] [lib32] [lib_only]
 
 usage()
 {
@@ -9,7 +9,8 @@ usage()
   echo "Syntax:  make-share.sh [debug] [macos-universal] [lib64]"
   echo ""
   echo "         debug: build with debug info"
-  echo "         macos-no-universal: do not build MacOS universal binaries"
+  echo "         macos-universal: build MacOS universal binaries"
+  echo "         macos-no-universal: do not build MacOS universal binaries (default)"
   echo "         lib_only: skip kstool & only build libraries"
   echo "         lib32: build 32bit libraries on 64bit system"
   echo ""