diff --git a/gradlew-fdroid b/gradlew-fdroid
index 847302ad..9b9899f8 100755
--- a/gradlew-fdroid
+++ b/gradlew-fdroid
@@ -168,7 +168,7 @@ v_all=${plugin_v[@]}
 for f in {.,..}/gradle/wrapper/gradle-wrapper.properties; do
     [[ -f $f ]] || continue
     while IFS='' read -r line || [ -n "$line" ]; do
-        line=$(printf $line | tr -d '\r') # strip Windows linefeeds
+        line=$(printf "$line" | tr -d '\r') # strip Windows linefeeds
         if [[ $line == 'distributionUrl='* ]]; then
             wrapper_ver=${line#*/gradle-}
             wrapper_ver=${wrapper_ver%-*.zip}
@@ -187,7 +187,7 @@ fi
 for f in {.,..}/build.gradle{,.kts}; do
     [[ -f $f ]] || continue
     while IFS='' read -r line || [ -n "$line" ]; do
-        line=$(printf $line | tr -d '\r') # strip Windows linefeeds
+        line=$(printf "$line" | tr -d '\r') # strip Windows linefeeds
         if [[ -z "$plugin_pver" && $line == *'com.android.tools.build:gradle:'* ]]; then
             plugin_pver=${line#*[\'\"]com.android.tools.build:gradle:}
             plugin_pver=${plugin_pver%[\'\"]*}
diff --git a/tests/test-gradlew-fdroid b/tests/test-gradlew-fdroid
index 2a34f971..63f74e5e 100755
--- a/tests/test-gradlew-fdroid
+++ b/tests/test-gradlew-fdroid
@@ -4,7 +4,7 @@ run_test() {
     red='\033[0;31m'
     green='\033[0;32m'
     nocolor='\033[0m'
-    cd $basedir/tests/source-files/$1
+    cd $source_files/$1
     printf "\n${1}:\n"
     if ($basedir/gradlew-fdroid 2>/dev/null || true) | grep -Fo "$2"; then
 	printf "${green}passed: $1\n"
@@ -17,15 +17,26 @@ run_test() {
 
 exit_value=0
 basedir=$(cd $(dirname $0)/..; pwd)
+source_files=$basedir/tests/source-files
 export https_proxy=127.7.7.7:7 # fake proxy to block downloading
 
-# force test file to have Windows linefeeds
-sed -i -e $'s/\r$//' -e  $'s/$/\r/' \
-    $basedir/tests/source-files/yuriykulikov/AlarmClock/gradle/wrapper/gradle-wrapper.properties
-
 run_test osmandapp/osmand 2.2.1
 run_test com.integreight.onesheeld 3.3
 run_test se.manyver/android 5.5
 run_test yuriykulikov/AlarmClock 5.1.1
 
+printf "\n\nforce test files to have Windows linefeeds:\n"
+tmpdir=`mktemp -d`
+cp -a $source_files/osmandapp $source_files/yuriykulikov $tmpdir/
+awk 'sub("$", "\r")' \
+    $source_files/yuriykulikov/AlarmClock/gradle/wrapper/gradle-wrapper.properties \
+    > $tmpdir/yuriykulikov/AlarmClock/gradle/wrapper/gradle-wrapper.properties
+awk 'sub("$", "\r")' \
+    $source_files/osmandapp/osmand/build.gradle \
+    > $tmpdir/osmandapp/osmand/build.gradle
+source_files=$tmpdir
+
+run_test yuriykulikov/AlarmClock 5.1.1
+run_test osmandapp/osmand 2.2.1
+
 exit $exit_value