diff --git a/generate/generate.go b/generate/generate.go
index 2125ed5..ae66258 100644
--- a/generate/generate.go
+++ b/generate/generate.go
@@ -428,80 +428,72 @@ func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource stri
 	case TypeString, TypeBuffer:
 		// SBA: <data: U8>*
 		// LBA: <length: UN> <data: U8>*
-		nn, err := this.iprintf("{\n")
-		this.push()
+		lengthVar := this.newTemporaryVar("length")
+		nn, err := this.iprintf("var %s uint64\n", lengthVar)
 		n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("var length uint64\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("if %s.Is(tape.LBA) {\n", tagSource)
-			n += nn; if err != nil { return n, err }
-			this.push()
-				nn, err = this.iprintf(
-					"length, nn, err = decoder.ReadUintN(int(%s.CN()))\n",
-					tagSource)
-				n += nn; if err != nil { return n, err }
-				nn, err = this.generateErrorCheck()
-				n += nn; if err != nil { return n, err }
-			this.pop()
-			nn, err = this.iprintf("} else {\n")
-			n += nn; if err != nil { return n, err }
-			this.push()
-				nn, err = this.iprintf("length = uint64(%s.CN())\n", tagSource)
-				n += nn; if err != nil { return n, err }
-			this.pop()
-			nn, err = this.iprintf("}\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("buffer := make([]byte, int(length))\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("nn, err = decoder.Read(buffer)\n")
+		nn, err = this.iprintf("if %s.Is(tape.LBA) {\n", tagSource)
+		n += nn; if err != nil { return n, err }
+		this.push()
+			nn, err = this.iprintf(
+				"%s, nn, err = decoder.ReadUintN(int(%s.CN()))\n",
+				lengthVar, tagSource)
 			n += nn; if err != nil { return n, err }
 			nn, err = this.generateErrorCheck()
 			n += nn; if err != nil { return n, err }
-			if _, ok := typ.(TypeString); ok {
-				nn, err = this.iprintf("*%s = string(buffer)\n", valueSource)
-				n += nn; if err != nil { return n, err }
-			} else {
-				nn, err = this.iprintf("*%s = buffer\n", valueSource)
-				n += nn; if err != nil { return n, err }
-			}
+		this.pop()
+		nn, err = this.iprintf("} else {\n")
+		n += nn; if err != nil { return n, err }
+		this.push()
+			nn, err = this.iprintf(
+				"%s = uint64(%s.CN())\n",
+				lengthVar, tagSource)
+			n += nn; if err != nil { return n, err }
 		this.pop()
 		nn, err = this.iprintf("}\n")
 		n += nn; if err != nil { return n, err }
+		nn, err = this.iprintf("buffer := make([]byte, int(%s))\n", lengthVar)
+		n += nn; if err != nil { return n, err }
+		nn, err = this.iprintf("nn, err = decoder.Read(buffer)\n")
+		n += nn; if err != nil { return n, err }
+		nn, err = this.generateErrorCheck()
+		n += nn; if err != nil { return n, err }
+		if _, ok := typ.(TypeString); ok {
+			nn, err = this.iprintf("*%s = string(buffer)\n", valueSource)
+			n += nn; if err != nil { return n, err }
+		} else {
+			nn, err = this.iprintf("*%s = buffer\n", valueSource)
+			n += nn; if err != nil { return n, err }
+		}
 	case TypeArray:
 		// OTA: <length: UN> <elementTag: tape.Tag> <values>*
-		nn, err := this.iprintf("{\n")
-		this.push()
+		lengthVar := this.newTemporaryVar("length")
+		nn, err := this.iprintf("var %s uint64\n", lengthVar)
 		n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("var length uint64\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf(
-				"length, nn, err = decoder.ReadUintN(int(%s.CN()))\n",
-				tagSource)
-			n += nn; if err != nil { return n, err }
-			nn, err = this.generateErrorCheck()
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("*%s = make(", valueSource)
-			n += nn; if err != nil { return n, err }
-			nn, err = this.generateType(typ)
-			n += nn; if err != nil { return n, err }
-			nn, err = this.printf(", int(length))\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("var itemTag tape.Tag\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("itemTag, nn, err = decoder.ReadTag()\n")
-			n += nn; if err != nil { return n, err }
-			nn, err = this.generateErrorCheck()
-			n += nn; if err != nil { return n, err }
-			nn, err = this.iprintf("for index := range length {\n")
-			n += nn; if err != nil { return n, err }
-			this.push()
-				nn, err = this.generateDecodeValue(
-					typ.Element,
-					fmt.Sprintf("(&(*%s)[index])", valueSource),
-					"itemTag")
-				n += nn; if err != nil { return n, err }
-			this.pop()
-			nn, err = this.iprintf("}\n")
+		nn, err = this.iprintf(
+			"%s, nn, err = decoder.ReadUintN(int(%s.CN()))\n",
+			lengthVar, tagSource)
+		n += nn; if err != nil { return n, err }
+		nn, err = this.generateErrorCheck()
+		n += nn; if err != nil { return n, err }
+		nn, err = this.iprintf("*%s = make(", valueSource)
+		n += nn; if err != nil { return n, err }
+		nn, err = this.generateType(typ)
+		n += nn; if err != nil { return n, err }
+		nn, err = this.printf(", int(%s))\n", lengthVar)
+		n += nn; if err != nil { return n, err }
+		nn, err = this.iprintf("var itemTag tape.Tag\n")
+		n += nn; if err != nil { return n, err }
+		nn, err = this.iprintf("itemTag, nn, err = decoder.ReadTag()\n")
+		n += nn; if err != nil { return n, err }
+		nn, err = this.generateErrorCheck()
+		n += nn; if err != nil { return n, err }
+		nn, err = this.iprintf("for index := range %s {\n", lengthVar)
+		n += nn; if err != nil { return n, err }
+		this.push()
+			nn, err = this.generateDecodeValue(
+				typ.Element,
+				fmt.Sprintf("(&(*%s)[index])", valueSource),
+				"itemTag")
 			n += nn; if err != nil { return n, err }
 		this.pop()
 		nn, err = this.iprintf("}\n")