diff --git a/zephyr-env.sh b/zephyr-env.sh
index d6bac0f4864..566146289fe 100644
--- a/zephyr-env.sh
+++ b/zephyr-env.sh
@@ -35,7 +35,7 @@ fi
 # .zephyrrc in your home directory. It will be automatically
 # run (if it exists) by this script.
 
-if uname | grep -q -P "MINGW"; then
+if uname | grep -q "MINGW"; then
     win_build=1
     PWD_OPT="-W"
 else