diff --git a/easybuild/easyblocks/r/rmpi.py b/easybuild/easyblocks/r/rmpi.py
index dfff74ec86..32035dcc66 100644
--- a/easybuild/easyblocks/r/rmpi.py
+++ b/easybuild/easyblocks/r/rmpi.py
@@ -80,4 +80,4 @@ def install_extension_async(self, *args, **kwargs):
         """
         self.prepare_rmpi_configureargs()
         # it might be needed to get the R cmd and run it with mympirun...
-        super(EB_Rmpi, self).install_extension_async(*args, **kwargs)
+        return super(EB_Rmpi, self).install_extension_async(*args, **kwargs)
diff --git a/easybuild/easyblocks/r/rserve.py b/easybuild/easyblocks/r/rserve.py
index f859e3555f..61e0f5abbf 100644
--- a/easybuild/easyblocks/r/rserve.py
+++ b/easybuild/easyblocks/r/rserve.py
@@ -45,4 +45,4 @@ def install_extension(self):
     def install_extension_async(self, *args, **kwargs):
         """Set LIBS environment variable correctly prior to building."""
         self.configurevars = ['LIBS="$LIBS -lpthread"']
-        super(EB_Rserve, self).install_extension_async(*args, **kwargs)
+        return super(EB_Rserve, self).install_extension_async(*args, **kwargs)