diff --git a/var/spack/repos/builtin/packages/flatcc/package.py b/var/spack/repos/builtin/packages/flatcc/package.py
index ce3fc222fcf..a9d3617c9b8 100644
--- a/var/spack/repos/builtin/packages/flatcc/package.py
+++ b/var/spack/repos/builtin/packages/flatcc/package.py
@@ -37,6 +37,9 @@ def cmake_args(self):
         spec = self.spec
         args = []
 
+        # allow flatcc to be built with more compilers
+        args.append('-DFLATCC_ALLOW_WERROR=OFF')
+
         if '+shared' in spec:
             args.append('-DBUILD_SHARED_LIBS=ON')
             args.append('-DFLATCC_INSTALL=ON')