diff --git a/backup.sh b/backup.sh
index e83cd48..565604d 100755
--- a/backup.sh
+++ b/backup.sh
@@ -15,12 +15,12 @@ done
 DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
 
 # Load Inquirer.sh
-source $DIR/inquirer-sh/list_input.sh
-source $DIR/inquirer-sh/text_input.sh
+source "$DIR/inquirer-sh/list_input.sh"
+source "$DIR/inquirer-sh/text_input.sh"
 # ---
 
 # Load all functions in ./functions
-for f in $DIR/functions/*; do source "$f"; done
+for f in "$DIR"/functions/*; do source "$f"; done
 
 check_adb_connection
 
diff --git a/functions/backup_func.sh b/functions/backup_func.sh
index 8076659..52526d9 100644
--- a/functions/backup_func.sh
+++ b/functions/backup_func.sh
@@ -94,7 +94,7 @@ function backup_func() {
   sleep 4
 
   # Copy backup_archive_info.txt to the archive
-  cp $DIR/extras/backup_archive_info.txt ./backup-tmp/PLEASE_READ.txt
+  cp "$DIR/extras/backup_archive_info.txt" ./backup-tmp/PLEASE_READ.txt
   echo "$APP_VERSION" > ./backup-tmp/version.txt
 
   # Compress
diff --git a/windows-dependencies/env-startup.sh b/windows-dependencies/env-startup.sh
index b1790eb..703dd9e 100644
--- a/windows-dependencies/env-startup.sh
+++ b/windows-dependencies/env-startup.sh
@@ -4,7 +4,7 @@
 export ADB_DIR=$(pwd)/windows-dependencies/adb/adb.exe
 
 adb() {
-     $ADB_DIR "$@"
+     "$ADB_DIR" "$@"
 }
 export -f adb