diff --git a/documentation/sdk-manual/working-projects.rst b/documentation/sdk-manual/working-projects.rst
index 4236bcec24..7df73b1b17 100644
--- a/documentation/sdk-manual/working-projects.rst
+++ b/documentation/sdk-manual/working-projects.rst
@@ -56,9 +56,10 @@ project:
 
          #include <stdio.h>
 
-         main()
+         int main()
              {
                  printf("Hello World!\n");
+                 return 0;
              }
 
    -  ``configure.ac``::