diff --git a/vpython b/vpython
index 4375390c9..45b0d02b5 100755
--- a/vpython
+++ b/vpython
@@ -41,8 +41,11 @@ base_dir=$(dirname "$0")
 source "$base_dir/cipd_bin_setup.sh"
 cipd_bin_setup &> /dev/null
 
-if [[ $(uname -s) = MINGW* || $(uname -s) = CYGWIN* ]]; then
+case $(uname -s) in
+MINGW*|CYGWIN*)
   cmd.exe //c $0.bat "$@"
-else
+  ;;
+*)
   exec "$base_dir/.cipd_bin/vpython" "$@"
-fi
+  ;;
+esac
diff --git a/vpython3 b/vpython3
index bcc63f935..27fcfc05a 100755
--- a/vpython3
+++ b/vpython3
@@ -39,8 +39,11 @@ base_dir=$(dirname "$0")
 source "$base_dir/cipd_bin_setup.sh"
 cipd_bin_setup &> /dev/null
 
-if [[ $(uname -s) = MINGW* || $(uname -s) = CYGWIN* ]]; then
+case $(uname -s) in
+MINGW*|CYGWIN*)
   cmd.exe //c $0.bat "$@"
-else
+  ;;
+*)
   exec "$base_dir/.cipd_bin/vpython3" "$@"
-fi
+  ;;
+esac