diff --git a/developer/src/kmc/src/commands/buildClasses/BuildProject.ts b/developer/src/kmc/src/commands/buildClasses/BuildProject.ts
index c65d6cf060..33db0c05fb 100644
--- a/developer/src/kmc/src/commands/buildClasses/BuildProject.ts
+++ b/developer/src/kmc/src/commands/buildClasses/BuildProject.ts
@@ -67,7 +67,7 @@ class ProjectBuilder {
 
     if(fs.statSync(this.infile).isDirectory()) {
       // This is a project folder, look for folder-name.kpj
-      this.infile = path.join(this.infile, path.basename(this.infile) + '.kpj');
+      this.infile = path.join(this.infile, path.basename(this.infile) + KeymanFileTypes.Source.Project);
     }
 
     const project = fs.existsSync(this.infile) ?