diff --git a/wrapper/unix/src/template.sh b/wrapper/unix/src/template.sh
index d6566483a..e5c5bc336 100755
--- a/wrapper/unix/src/template.sh
+++ b/wrapper/unix/src/template.sh
@@ -83,7 +83,7 @@
             JAVA_OPTS=()
         fi
 
-        if [[ "$(uname -o 2>&1)" == "Msys" ]] && hash winpty 2>/dev/null; then
+        if [[ "$(uname -o 2>&1)" == "Msys" ]] && hash winpty 2>/dev/null && [ -t /dev/stdin ]; then
             GIT_BASH_PTY_WORKAROUND=(winpty)
         else
             GIT_BASH_PTY_WORKAROUND=()