diff --git a/maven-wrapper-distribution/src/resources/only-mvnw b/maven-wrapper-distribution/src/resources/only-mvnw
index cc908627..816c76ab 100755
--- a/maven-wrapper-distribution/src/resources/only-mvnw
+++ b/maven-wrapper-distribution/src/resources/only-mvnw
@@ -71,8 +71,9 @@ set_java_home() {
 # hash string like Java String::hashCode
 hash_string() {
   str="${1:-}" h=0
-  while [ -n "$str" ]; do
-    h=$(( ( h * 31 + $(LC_CTYPE=C printf %d "'$str") ) % 4294967296 ))
+  while [ "$str" != "" ]; do
+    char="${str%${str#?}}"
+    h=$(( ( h * 31 + $(LC_CTYPE=C printf %d "'$char") ) % 4294967296 ))
     str="${str#?}"
   done
   printf %x\\n $h