diff --git a/lib/exec_wrapper.js b/lib/exec_wrapper.js
index cabf03f5e..4d1ee6f27 100644
--- a/lib/exec_wrapper.js
+++ b/lib/exec_wrapper.js
@@ -15,17 +15,26 @@ async function exec_wrapper(commandLine, args, options) {
     let stderr = '';
     let listeners = {
         stdout: (data) => {
-            var _a, _b, _c;
+            var _a;
             stdout += data.toString();
-            // NB change behaviour to only write to stdout/err if no listener passed
-            process.stdout.write(data);
-            (_c = (_a = originalListener) === null || _a === void 0 ? void 0 : (_b = _a).stdout) === null || _c === void 0 ? void 0 : _c.call(_b, data);
+            if (((_a = originalListener) === null || _a === void 0 ? void 0 : _a.stdout) !== undefined) {
+                originalListener.stdout(data);
+            }
+            else {
+                // if no stdout listener was originally defined then match behaviour of exec.exec
+                process.stdout.write(data);
+            }
         },
         stderr: (data) => {
-            var _a, _b, _c;
+            var _a;
             stderr += data.toString();
-            process.stderr.write(data);
-            (_c = (_a = originalListener) === null || _a === void 0 ? void 0 : (_b = _a).stderr) === null || _c === void 0 ? void 0 : _c.call(_b, data);
+            if (((_a = originalListener) === null || _a === void 0 ? void 0 : _a.stderr) !== undefined) {
+                originalListener.stderr(data);
+            }
+            else {
+                // if no stderr listener was originally defined then match behaviour of exec.exec
+                process.stderr.write(data);
+            }
         }
     };
     const returnCode = await exec.exec(commandLine, args, {
diff --git a/lib/exec_wrapper.js.map b/lib/exec_wrapper.js.map
index a05333309..9782a3592 100644
--- a/lib/exec_wrapper.js.map
+++ b/lib/exec_wrapper.js.map
@@ -1 +1 @@
-{"version":3,"file":"exec_wrapper.js","sourceRoot":"","sources":["../src/exec_wrapper.ts"],"names":[],"mappings":";;;;;;;;;AAAA,oDAAsC;AAG/B,KAAK,UAAU,YAAY,CAAC,WAAmB,EAAE,IAAe,EAAE,OAAwB;;IAE/F,MAAM,gBAAgB,SAAG,OAAO,0CAAE,SAAS,CAAC;IAE5C,IAAI,MAAM,GAAG,EAAE,CAAC;IAChB,IAAI,MAAM,GAAG,EAAE,CAAC;IAEhB,IAAI,SAAS,GAAG;QACd,MAAM,EAAE,CAAC,IAAY,EAAE,EAAE;;YACvB,MAAM,IAAI,IAAI,CAAC,QAAQ,EAAE,CAAC;YAC1B,wEAAwE;YACxE,OAAO,CAAC,MAAM,CAAC,KAAK,CAAC,IAAI,CAAC,CAAC;YAC3B,YAAA,gBAAgB,iDAAE,MAAM,mDAAG,IAAI,EAAE;QACnC,CAAC;QACD,MAAM,EAAE,CAAC,IAAY,EAAE,EAAE;;YACvB,MAAM,IAAI,IAAI,CAAC,QAAQ,EAAE,CAAC;YAC1B,OAAO,CAAC,MAAM,CAAC,KAAK,CAAC,IAAI,CAAC,CAAC;YAC3B,YAAA,gBAAgB,iDAAE,MAAM,mDAAG,IAAI,EAAE;QACnC,CAAC;KACF,CAAC;IAEF,MAAM,UAAU,GAAG,MAAM,IAAI,CAAC,IAAI,CAChC,WAAW,EACX,IAAI,EACJ;QACE,SAAS,EAAE,SAAS;QACpB,GAAG,OAAO;KACX,CAAC,CAAC;IAEL,IAAI,MAAM,KAAK,MAAM,EAAG;QACtB,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,CAAC;KACxB;IAED,OAAO,UAAU,CAAC;AAEpB,CAAC;AAnCD,oCAmCC"}
\ No newline at end of file
+{"version":3,"file":"exec_wrapper.js","sourceRoot":"","sources":["../src/exec_wrapper.ts"],"names":[],"mappings":";;;;;;;;;AAAA,oDAAsC;AAG/B,KAAK,UAAU,YAAY,CAAC,WAAmB,EAAE,IAAe,EAAE,OAAwB;;IAE/F,MAAM,gBAAgB,SAAG,OAAO,0CAAE,SAAS,CAAC;IAE5C,IAAI,MAAM,GAAG,EAAE,CAAC;IAChB,IAAI,MAAM,GAAG,EAAE,CAAC;IAEhB,IAAI,SAAS,GAAG;QACd,MAAM,EAAE,CAAC,IAAY,EAAE,EAAE;;YACvB,MAAM,IAAI,IAAI,CAAC,QAAQ,EAAE,CAAC;YAC1B,IAAI,OAAA,gBAAgB,0CAAE,MAAM,MAAK,SAAS,EAAE;gBAC1C,gBAAgB,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;aAC/B;iBAAM;gBACL,iFAAiF;gBACjF,OAAO,CAAC,MAAM,CAAC,KAAK,CAAC,IAAI,CAAC,CAAC;aAC5B;QAEH,CAAC;QACD,MAAM,EAAE,CAAC,IAAY,EAAE,EAAE;;YACvB,MAAM,IAAI,IAAI,CAAC,QAAQ,EAAE,CAAC;YAC1B,IAAI,OAAA,gBAAgB,0CAAE,MAAM,MAAK,SAAS,EAAE;gBAC1C,gBAAgB,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;aAC/B;iBAAM;gBACL,iFAAiF;gBACjF,OAAO,CAAC,MAAM,CAAC,KAAK,CAAC,IAAI,CAAC,CAAC;aAC5B;QACH,CAAC;KACF,CAAC;IAEF,MAAM,UAAU,GAAG,MAAM,IAAI,CAAC,IAAI,CAChC,WAAW,EACX,IAAI,EACJ;QACE,SAAS,EAAE,SAAS;QACpB,GAAG,OAAO;KACX,CAAC,CAAC;IAEL,IAAI,MAAM,KAAK,MAAM,EAAG;QACtB,OAAO,CAAC,GAAG,CAAC,SAAS,CAAC,CAAC;KACxB;IAED,OAAO,UAAU,CAAC;AAEpB,CAAC;AA3CD,oCA2CC"}
\ No newline at end of file
diff --git a/src/exec_wrapper.ts b/src/exec_wrapper.ts
index 6ddbad7d5..484e64121 100644
--- a/src/exec_wrapper.ts
+++ b/src/exec_wrapper.ts
@@ -11,14 +11,22 @@ export async function exec_wrapper(commandLine: string, args?: string[], options
   let listeners = {
     stdout: (data: Buffer) => {
       stdout += data.toString();
-      // NB change behaviour to only write to stdout/err if no listener passed
-      process.stdout.write(data);
-      originalListener?.stdout?.(data);
+      if (originalListener?.stdout !== undefined) {
+        originalListener.stdout(data);
+      } else {
+        // if no stdout listener was originally defined then match behaviour of exec.exec
+        process.stdout.write(data);
+      }
+
     },
     stderr: (data: Buffer) => {
       stderr += data.toString();
-      process.stderr.write(data);
-      originalListener?.stderr?.(data);
+      if (originalListener?.stderr !== undefined) {
+        originalListener.stderr(data);
+      } else {
+        // if no stderr listener was originally defined then match behaviour of exec.exec
+        process.stderr.write(data);
+      }
     }
   };