diff --git a/premix/js_tracer.nim b/premix/js_tracer.nim
index 1dc29a6e9..1399eefb9 100644
--- a/premix/js_tracer.nim
+++ b/premix/js_tracer.nim
@@ -1,66 +1,68 @@
 const postStateTracer* = """{
-	postState: {},
+  postState: {},
 
-	// lookupAccount injects the specified account into the postState object.
-	lookupAccount: function(addr, db){
-		var acc = toHex(addr);
-		if (this.postState[acc] === undefined) {
-			this.postState[acc] = {
-				code:    toHex(db.getCode(addr)),
-				storage: {}
-			};
-		}
-	},
+  // lookupAccount injects the specified account into the postState object.
+  lookupAccount: function(addr, db){
+    var acc = toHex(addr);
+    if (this.postState[acc] === undefined) {
+      this.postState[acc] = {
+        code:    toHex(db.getCode(addr)),
+        storage: {}
+      };
+    }
+  },
 
-	// lookupStorage injects the specified storage entry of the given account into
-	// the postState object.
-	lookupStorage: function(addr, key, db){
-		var acc = toHex(addr);
-		var idx = toHex(key);
+  // lookupStorage injects the specified storage entry of the given account into
+  // the postState object.
+  lookupStorage: function(addr, key, db){
+    var acc = toHex(addr);
+    var idx = toHex(key);
     this.lookupAccount(addr, db);
-		if (this.postState[acc].storage[idx] === undefined) {
+    if (this.postState[acc].storage[idx] === undefined) {
+      // bug in geth js tracer
+      // we will use eth_getProof to fill the storage later
       this.postState[acc].storage[idx] = "";
-		}
-	},
+    }
+  },
 
-	// result is invoked when all the opcodes have been iterated over and returns
-	// the final result of the tracing.
-	result: function(ctx, db) {
-		this.lookupAccount(ctx.from, db);
+  // result is invoked when all the opcodes have been iterated over and returns
+  // the final result of the tracing.
+  result: function(ctx, db) {
+    this.lookupAccount(ctx.from, db);
     this.lookupAccount(ctx.to, db);
 
-		// Return the assembled allocations (postState)
-		return this.postState;
-	},
+    // Return the assembled allocations (postState)
+    return this.postState;
+  },
 
-	// step is invoked for every opcode that the VM executes.
-	step: function(log, db) {
-		// Add the current account if we just started tracing
-		if (this.postState === null){
-			this.postState = {};
-			// Balance will potentially be wrong here, since this will include the value
-			// sent along with the message. We fix that in 'result()'.
-			this.lookupAccount(log.contract.getAddress(), db);
-		}
-		// Whenever new state is accessed, add it to the postState
-		switch (log.op.toString()) {
-			case "EXTCODECOPY": case "EXTCODESIZE": case "BALANCE":
-				this.lookupAccount(toAddress(log.stack.peek(0).toString(16)), db);
-				break;
-			case "CREATE":
-				var from = log.contract.getAddress();
-				this.lookupAccount(toContract(from, db.getNonce(from)), db);
-				break;
-			case "CALL": case "CALLCODE": case "DELEGATECALL": case "STATICCALL":
-				this.lookupAccount(toAddress(log.stack.peek(1).toString(16)), db);
-				break;
-			case 'SSTORE':case 'SLOAD':
-				this.lookupStorage(log.contract.getAddress(), toWord(log.stack.peek(0).toString(16)), db);
-				break;
-		}
-	},
+  // step is invoked for every opcode that the VM executes.
+  step: function(log, db) {
+    // Add the current account if we just started tracing
+    if (this.postState === null){
+      this.postState = {};
+      // Balance will potentially be wrong here, since this will include the value
+      // sent along with the message. We fix that in 'result()'.
+      this.lookupAccount(log.contract.getAddress(), db);
+    }
+    // Whenever new state is accessed, add it to the postState
+    switch (log.op.toString()) {
+      case "EXTCODECOPY": case "EXTCODESIZE": case "BALANCE":
+        this.lookupAccount(toAddress(log.stack.peek(0).toString(16)), db);
+        break;
+      case "CREATE":
+        var from = log.contract.getAddress();
+        this.lookupAccount(toContract(from, db.getNonce(from)), db);
+        break;
+      case "CALL": case "CALLCODE": case "DELEGATECALL": case "STATICCALL":
+        this.lookupAccount(toAddress(log.stack.peek(1).toString(16)), db);
+        break;
+      case 'SSTORE':case 'SLOAD':
+        this.lookupStorage(log.contract.getAddress(), toWord(log.stack.peek(0).toString(16)), db);
+        break;
+    }
+  },
 
-	// fault is invoked when the actual execution of an opcode fails.
-	fault: function(log, db) {}
+  // fault is invoked when the actual execution of an opcode fails.
+  fault: function(log, db) {}
 }
 """