diff --git a/var/spack/repos/builtin/packages/swiftsim/package.py b/var/spack/repos/builtin/packages/swiftsim/package.py
index 3319b6c997e..ad31864ea74 100644
--- a/var/spack/repos/builtin/packages/swiftsim/package.py
+++ b/var/spack/repos/builtin/packages/swiftsim/package.py
@@ -47,5 +47,6 @@ def configure_args(self):
             '--enable-mpi' if '+mpi' in self.spec else '--disable-mpi',
             '--with-metis={0}'.format(self.spec['metis'].prefix),
             '--disable-dependency-tracking',
-            '--enable-optimization'
+            '--enable-optimization',
+            '--enable-compiler-warnings=yes',
         ]