diff --git a/core/src/main/java/io/undertow/protocols/ajp/AjpResponseParser.java b/core/src/main/java/io/undertow/protocols/ajp/AjpResponseParser.java
index 9c7d654712..7619c0fd0a 100644
--- a/core/src/main/java/io/undertow/protocols/ajp/AjpResponseParser.java
+++ b/core/src/main/java/io/undertow/protocols/ajp/AjpResponseParser.java
@@ -224,11 +224,6 @@ public int getReadBodyChunkSize() {
      */
     public int stringLength = -1;
 
-    /**
-     * The current string being read
-     */
-    public StringBuilder currentString;
-
     /**
      * when reading the first byte of an integer this stores the first value. It is set to -1 to signify that
      * the first byte has not been read yet.
@@ -248,7 +243,6 @@ public void reset() {
         reasonPhrase = null;
         headers = new HeaderMap();
         stringLength = -1;
-        currentString = null;
         currentIntegerPart = -1;
         readHeaders = 0;
     }
@@ -300,12 +294,8 @@ protected StringHolder parseString(ByteBuffer buf, boolean header) {
             this.stringLength = -1;
             return new StringHolder(null, true, false);
         }
-        StringBuilder builder = this.currentString;
+        final StringBuilder builder = new StringBuilder();
 
-        if (builder == null) {
-            builder = new StringBuilder();
-            this.currentString = builder;
-        }
         int length = builder.length();
         while (length < stringLength) {
             if (!buf.hasRemaining()) {
@@ -323,7 +313,6 @@ protected StringHolder parseString(ByteBuffer buf, boolean header) {
 
         if (buf.hasRemaining()) {
             buf.get(); //null terminator
-            this.currentString = null;
             this.stringLength = -1;
             this.containsUrlCharacters = false;
             return new StringHolder(builder.toString(), true, containsUrlCharacters);
diff --git a/core/src/main/java/io/undertow/protocols/http2/HpackDecoder.java b/core/src/main/java/io/undertow/protocols/http2/HpackDecoder.java
index 3c1da0bee1..ce5ec6fd01 100644
--- a/core/src/main/java/io/undertow/protocols/http2/HpackDecoder.java
+++ b/core/src/main/java/io/undertow/protocols/http2/HpackDecoder.java
@@ -73,8 +73,6 @@ public class HpackDecoder {
 
     private boolean first = true;
 
-    private final StringBuilder stringBuilder = new StringBuilder();
-
     public HpackDecoder(int maxAllowedMemorySize) {
         this.specifiedMemorySize = Math.min(Hpack.DEFAULT_TABLE_SIZE, maxAllowedMemorySize);
         this.maxAllowedMemorySize = maxAllowedMemorySize;
@@ -247,11 +245,11 @@ private String readHpackString(ByteBuffer buffer) throws HpackException {
         if (huffman) {
             return readHuffmanString(length, buffer);
         }
+        StringBuilder stringBuilder = new StringBuilder(length);
         for (int i = 0; i < length; ++i) {
             stringBuilder.append((char) (buffer.get() & 0xFF));
         }
         String ret = stringBuilder.toString();
-        stringBuilder.setLength(0);
         if (ret.isEmpty()) {
             //return the interned empty string, rather than allocating a new one each time
             return "";
@@ -260,12 +258,12 @@ private String readHpackString(ByteBuffer buffer) throws HpackException {
     }
 
     private String readHuffmanString(int length, ByteBuffer buffer) throws HpackException {
+        StringBuilder stringBuilder = new StringBuilder(length);
         HPackHuffman.decode(buffer, length, stringBuilder);
         String ret = stringBuilder.toString();
         if (ret.isEmpty()) {
             return "";
         }
-        stringBuilder.setLength(0);
         return ret;
     }