diff --git a/easybuild/easyblocks/f/fftw.py b/easybuild/easyblocks/f/fftw.py
index ff3788a4e2..baa287e2d5 100644
--- a/easybuild/easyblocks/f/fftw.py
+++ b/easybuild/easyblocks/f/fftw.py
@@ -37,7 +37,7 @@
 from easybuild.tools.build_log import EasyBuildError
 from easybuild.tools.config import build_option
 from easybuild.tools.modules import get_software_version
-from easybuild.tools.systemtools import AARCH32, AARCH64, POWER, X86_64
+from easybuild.tools.systemtools import AARCH32, AARCH64, POWER, RISCV32, RISCV64, X86_64
 from easybuild.tools.systemtools import get_cpu_architecture, get_cpu_features, get_shared_lib_ext
 from easybuild.tools.toolchain.compiler import OPTARCH_GENERIC
 from easybuild.tools.utilities import nub
@@ -141,7 +141,7 @@ def __init__(self, *args, **kwargs):
                     setattr(self, flag, True)
 
         # Auto-disable quad-precision on ARM and POWER, as it is unsupported
-        if self.cfg['with_quad_prec'] and cpu_arch in [AARCH32, AARCH64, POWER]:
+        if self.cfg['with_quad_prec'] and cpu_arch in [AARCH32, AARCH64, POWER, RISCV32, RISCV64]:
             self.cfg['with_quad_prec'] = False
             self.log.debug("Quad-precision automatically disabled; not supported on %s.", cpu_arch)