diff --git a/rescript b/rescript
index d63cd56c64..2cb337441b 100755
--- a/rescript
+++ b/rescript
@@ -30,9 +30,14 @@ process.env.BSB_PROJECT_ROOT = cwd;
 
 // If the project uses gentype and uses custom file extension
 // via generatedFileExtension, ignore them in watch mode
-var genTypeConfig = require(path.join(cwd, bsconfig)).gentypeconfig
-if (genTypeConfig) {
-  var genTypeFileExtension = genTypeConfig.generatedFileExtension
+var bsConfigFile = path.join(cwd, bsconfig);
+var genTypeFileExtension = undefined;
+
+if (fs.existsSync(bsConfigFile)) {
+  var genTypeConfig = require(bsConfigFile).gentypeconfig
+  if (genTypeConfig) {
+    genTypeFileExtension = genTypeConfig.generatedFileExtension
+  }
 }
 
 // All clients of type MiniWebSocket
@@ -413,7 +418,7 @@ if (
         fileName.endsWith(".mjs") ||
         fileName.endsWith(".cjs") ||
         fileName.endsWith(".gen.tsx") ||
-        fileName.endsWith(genTypeFileExtension) ||
+        (genTypeFileExtension && fileName.endsWith(genTypeFileExtension)) ||
         watch_generated.indexOf(fileName) >= 0 ||
         fileName.endsWith(".swp")
       );