diff --git a/src/baseplatform.ts b/src/baseplatform.ts
index b8115089..13e8f8e9 100644
--- a/src/baseplatform.ts
+++ b/src/baseplatform.ts
@@ -1,5 +1,5 @@
 
-import { RAM, RasterVideo, dumpRAM, lookupSymbol } from "./emu";
+import { RAM, RasterVideo, dumpRAM } from "./emu";
 import { hex, printFlags, invertMap } from "./util";
 import { CodeAnalyzer } from "./analysis";
 import { disassemble6502 } from "./cpu/disasm6502";
@@ -932,7 +932,7 @@ export function dumpStackToString(platform:Platform, mem:Uint8Array|number[], st
     var opcode = read(addr + jsrofs); // might be out of bounds
     if (opcode == jsrop) { // JSR
       s += "\n$" + hex(sp) + ": ";
-      s += hex(addr,4) + " " + lookupSymbol(addr);
+      s += hex(addr,4) + " " + lookupSymbol(platform, addr);
       sp++;
       nraw = 0;
     } else {
@@ -944,3 +944,20 @@ export function dumpStackToString(platform:Platform, mem:Uint8Array|number[], st
   }
   return s+"\n";
 }
+
+export function lookupSymbol(platform:Platform, addr:number) {
+  var start = addr;
+  var foundsym;
+  var addr2symbol = platform.debugSymbols && platform.debugSymbols.addr2symbol;
+  while (addr2symbol && addr >= 0) {
+    var sym = addr2symbol[addr];
+    if (sym && sym.startsWith('_')) { // return first C symbol we find
+      return addr2symbol[addr] + " + " + (start-addr);
+    } else if (sym && !foundsym) { // cache first non-C symbol found
+      foundsym = sym;
+    }
+    addr--;
+  }
+  return foundsym || "";
+}
+
diff --git a/src/emu.ts b/src/emu.ts
index c5d785b5..7d75af36 100644
--- a/src/emu.ts
+++ b/src/emu.ts
@@ -445,22 +445,3 @@ export function newAddressDecoder(table : AddressDecoderEntry[], options?:Addres
   return new (AddressDecoder as any)(table, options);
 }
 
-// STACK DUMP
-
-var addr2symbol = {};		// address to symbol name map (TODO: import)
-
-export function lookupSymbol(addr) {
-  var start = addr;
-  var foundsym;
-  while (addr2symbol && addr >= 0) {
-    var sym = addr2symbol[addr];
-    if (sym && sym.startsWith('_')) { // return first C symbol we find
-      return addr2symbol[addr] + " + " + (start-addr);
-    } else if (sym && !foundsym) { // cache first non-C symbol found
-      foundsym = sym;
-    }
-    addr--;
-  }
-  return foundsym || "";
-}
-