diff --git a/dist/index.js b/dist/index.js
index 3a1e577c..d2cb36ca 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -5180,7 +5180,7 @@ var ContainerAppHelper = /** @class */ (function () {
                         return [4 /*yield*/, toolHelper.which("docker", true)];
                     case 2:
                         dockerTool = _a.sent();
-                        command = "run --rm -v " + appSourcePath + ":/app " + ORYX_CLI_IMAGE + " /bin/bash -c oryx dockerfile /app | head -n 1 | sed 's/ARG RUNTIME=//' >> /app/oryx-runtime.txt";
+                        command = "run --rm -v " + appSourcePath + ":/app " + ORYX_CLI_IMAGE + " /bin/bash -c \"oryx dockerfile /app | head -n 1 | sed 's/ARG RUNTIME=//' >> /app/oryx-runtime.txt\"";
                         return [4 /*yield*/, util.executeAndThrowIfError(dockerTool + " " + command)
                             // Read the temp file to get the runtime stack into a variable
                         ];
diff --git a/src/ContainerAppHelper.ts b/src/ContainerAppHelper.ts
index 7216e154..72b60343 100644
--- a/src/ContainerAppHelper.ts
+++ b/src/ContainerAppHelper.ts
@@ -362,7 +362,7 @@ export class ContainerAppHelper {
         try {
             let dockerTool: string = await toolHelper.which("docker", true);
             // Use 'oryx dockerfile' command to determine the runtime stack to use and write it to a temp file
-            let command = `run --rm -v ${appSourcePath}:/app ${ORYX_CLI_IMAGE} /bin/bash -c oryx dockerfile /app | head -n 1 | sed 's/ARG RUNTIME=//' >> /app/oryx-runtime.txt`
+            let command = `run --rm -v ${appSourcePath}:/app ${ORYX_CLI_IMAGE} /bin/bash -c \"oryx dockerfile /app | head -n 1 | sed 's/ARG RUNTIME=//' >> /app/oryx-runtime.txt\"`
             await util.executeAndThrowIfError(`${dockerTool} ${command}`)
 
             // Read the temp file to get the runtime stack into a variable