diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..f3416702
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+# The worktree lives on an SMB share that a Windows client also writes to.
+# Without this it writes CRLF back, which makes build.sh unexecutable on Linux
+# (the interpreter becomes "/bin/bash\r").
+* text=auto eol=lf