diff --git a/var/spack/repos/builtin/packages/linsys-v/package.py b/var/spack/repos/builtin/packages/linsys-v/package.py
index cc8e94c26bb..545a2a8bec9 100644
--- a/var/spack/repos/builtin/packages/linsys-v/package.py
+++ b/var/spack/repos/builtin/packages/linsys-v/package.py
@@ -50,7 +50,9 @@ def patch(self):
             )
             makefile.filter(
                 r"^CFLAGS\s+=\s-Kfast,openmp",
-                "CFLAGS=-Ofast {0}".format(self.compiler.openmp_flag),
+                "CFLAGS=-Ofast -fstrict-aliasing {0}".format(
+                    self.compiler.openmp_flag
+                ),
             )
             makefile.filter(
                 r"^LIBS\s+=\s-SCALAPACK\s-SSL2BLAMP",