diff --git a/developer/src/kmc-kmn/src/compiler/compiler.ts b/developer/src/kmc-kmn/src/compiler/compiler.ts
index a380c21e94..69333d1ba3 100644
--- a/developer/src/kmc-kmn/src/compiler/compiler.ts
+++ b/developer/src/kmc-kmn/src/compiler/compiler.ts
@@ -60,9 +60,10 @@ export class Compiler {
 
     options = {...baseOptions, ...options};
 
-    (globalThis as any).msgproc = function(line: number, code: number, msg: string) {
+    (globalThis as any).msgproc = function(line: number, code: number, msg: string): number {
       // TODO: link into the kmc error reporting infrastructure
-      console.log(`[${line}] ${code}: ${msg}`);
+      console.log(`[${line}] ${code.toString(16)}: ${msg}`);
+      return 1; // 1 == continue build
     }
 
     // TODO: use callbacks for file access -- so kmc-kmn is entirely fs agnostic
@@ -83,7 +84,8 @@ export class Compiler {
         outfile,
         options.saveDebug ? 1 : 0,
         options.compilerWarningsAsErrors ? 1 : 0,
-        options.warnDeprecatedCode ? 1 : 0, 'msgproc');
+        options.warnDeprecatedCode ? 1 : 0,
+        'msgproc');
     } catch(e) {
       // TODO: use sentry
       console.error(e);
diff --git a/developer/src/kmcmplib/src/CompilerInterfaces.cpp b/developer/src/kmcmplib/src/CompilerInterfaces.cpp
index 09afa1d2cb..3b5d5a2cfc 100644
--- a/developer/src/kmcmplib/src/CompilerInterfaces.cpp
+++ b/developer/src/kmcmplib/src/CompilerInterfaces.cpp
@@ -30,7 +30,7 @@ EXTERN bool kmcmp_SetCompilerOptions(KMCMP_COMPILER_OPTIONS* options) {
   WASM interface for compiler message callback
 */
 EM_JS(int, wasm_msgproc, (int line, int msgcode, char* text, char* context), {
-  const proc = globalThis[context];
+  const proc = globalThis[UTF8ToString(context)];
   if(!proc || typeof proc != 'function') {
     console.log(`[${line}: ${msgcode}: ${UTF8ToString(text)}]`);
     return 0;