diff --git a/petsc.spec b/petsc.spec
index fb2bcad..20eb956 100644
--- a/petsc.spec
+++ b/petsc.spec
@@ -63,7 +63,9 @@
 ## Sundials needs mpi ?
 %bcond_with sundials_serial
 #
+%if %{?__isa_bits:%{__isa_bits}}%{!?__isa_bits:32} == 32
 %bcond_without superlu
+%endif
 #
 
 ## Suitesparse
@@ -1168,6 +1170,7 @@ xvfb-run -a make MAKE_NP=$RPM_BUILD_NCPUS all test -C build64 V=1 MPIEXEC='%{_bu
 * Thu Feb 23 2023 Antonio Trande <sagitter@fedoraproject.org> - 3.17.4-12
 - Enable PETSC_INDEX_SIZE_64 in 64-bit architectures
 - Use always metis64 in 64-bit architectures
+- Use SuperLU in 32-bit architectures only
 
 * Thu Feb 23 2023 Antonio Trande <sagitter@fedoraproject.org> - 3.17.4-11
 - Disable LTO flags