diff --git a/python-bin/python3 b/python-bin/python3
index 87cf0ca69..eec359016 100755
--- a/python-bin/python3
+++ b/python-bin/python3
@@ -2,6 +2,11 @@
 
 DEPOT_TOOLS=$(dirname "$0")/..
 
-PYTHON3_BIN_DIR="$DEPOT_TOOLS/$(cat $DEPOT_TOOLS/python3_bin_reldir.txt | xargs echo)"
+if [ "$OSTYPE" = "msys" ]
+then
+  PYTHON3_BIN_DIR="$DEPOT_TOOLS/$(sed -e 's-\\-/-g' $DEPOT_TOOLS/python3_bin_reldir.txt)"
+else
+  PYTHON3_BIN_DIR="$DEPOT_TOOLS/$(cat $DEPOT_TOOLS/python3_bin_reldir.txt)"
+fi
 PATH="$PYTHON3_BIN_DIR":"$PYTHON3_BIN_DIR/Scripts":"$PATH"
 "$PYTHON3_BIN_DIR/python3" "$@"