diff --git a/lib.sh b/lib.sh
index 5090f6e..820641d 100644
--- a/lib.sh
+++ b/lib.sh
@@ -6,20 +6,20 @@
     then
         echo "esptool.py"
     else
-    if ! command -v py &> /dev/null
+    if ! command -v py.exe &> /dev/null
         then
-            echo "esptool.py nor py could not be found. Please install it first."
+            echo "esptool.py nor py.exe could not be found. Please install it first."
             exit 1
         fi
         # check if esptool is installed as a module
-        if py -m esptool --help &> /dev/null
+        if py.exe -m esptool --help &> /dev/null
         then
-            echo "py -m esptool"
+            echo "py.exe -m esptool"
         else
             echo "install esptool module for python first."
-            py -m pip install esptool
+            py.exe -m pip install esptool
         fi
-        echo "py -m esptool"
+        echo "py.exe -m esptool"
     fi
 }