diff --git a/lib/coins/compress.js b/lib/coins/compress.js
index 7bd38cec..5a572e8e 100644
--- a/lib/coins/compress.js
+++ b/lib/coins/compress.js
@@ -30,8 +30,6 @@ const EMPTY_BUFFER = Buffer.alloc(0);
  */
 
 function compressScript(script, bw) {
-  let data;
-
   // Attempt to compress the output scripts.
   // We can _only_ ever compress them if
   // they are serialized as minimaldata, as
@@ -41,18 +39,18 @@ function compressScript(script, bw) {
   // P2PKH -> 0 | key-hash
   // Saves 5 bytes.
   if (script.isPubkeyhash(true)) {
-    data = script.code[2].data;
+    let hash = script.code[2].data;
     bw.writeU8(0);
-    bw.writeBytes(data);
+    bw.writeBytes(hash);
     return bw;
   }
 
   // P2SH -> 1 | script-hash
   // Saves 3 bytes.
   if (script.isScripthash()) {
-    data = script.code[1].data;
+    let hash = script.code[1].data;
     bw.writeU8(1);
-    bw.writeBytes(data);
+    bw.writeBytes(hash);
     return bw;
   }
 
@@ -60,10 +58,10 @@ function compressScript(script, bw) {
   // Only works if the key is valid.
   // Saves up to 35 bytes.
   if (script.isPubkey(true)) {
-    data = script.code[0].data;
-    if (publicKeyVerify(data)) {
-      data = compressKey(data);
-      bw.writeBytes(data);
+    let key = script.code[0].data;
+    if (publicKeyVerify(key)) {
+      key = compressKey(key);
+      bw.writeBytes(key);
       return bw;
     }
   }
@@ -129,7 +127,7 @@ function decompressScript(script, br) {
  */
 
 function sizeScript(script) {
-  let size, data;
+  let size;
 
   if (script.isPubkeyhash(true))
     return 21;
@@ -138,8 +136,8 @@ function sizeScript(script) {
     return 21;
 
   if (script.isPubkey(true)) {
-    data = script.code[0].data;
-    if (publicKeyVerify(data))
+    let key = script.code[0].data;
+    if (publicKeyVerify(key))
       return 33;
   }