diff --git a/debian/changelog b/debian/changelog
index b26c353d..b985f729 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+llvm-toolchain-15 (1:15.0.6-5~exp2) experimental; urgency=medium
+
+  * Restrict flang on 64bits archs:
+    (amd64 arm64 mips64el ppc64el kfreebsd-amd64 s390x ppc64 sparc64 riscv64)
+    See: https://github.com/llvm/llvm-project/issues/59845
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Fri, 06 Jan 2023 13:19:48 +0100
+
 llvm-toolchain-15 (1:15.0.6-5~exp1) experimental; urgency=medium
 
   * Add flang-15 and libraries support
diff --git a/debian/control.in b/debian/control.in
index 33b94a03..4e163817 100644
--- a/debian/control.in
+++ b/debian/control.in
@@ -931,7 +931,9 @@ Description: Post-link optimizer
 # ------------- flang -------------
 
 Package: flang-@LLVM_VERSION@
-Architecture: any
+# no 32bit support
+# https://github.com/llvm/llvm-project/issues/59845
+Architecture: amd64 arm64 mips64el ppc64el kfreebsd-amd64 s390x ppc64 sparc64 riscv64
 Depends: ${shlibs:Depends}, ${misc:Depends}, ${dep:devlibs},
 Provides: fortran-compiler, gfortran-mod-15
 Description: Fortran compiler
@@ -942,7 +944,7 @@ Description: Fortran compiler
  of examples, some functionalities are still missing.
 
 Package: libflang-@LLVM_VERSION@-dev
-Architecture: any
+Architecture: amd64 arm64 mips64el ppc64el kfreebsd-amd64 s390x ppc64 sparc64 riscv64
 Section: libdevel
 Depends: ${shlibs:Depends}, ${misc:Depends}, ${dep:devlibs},
 Description: Flang library - Development package
diff --git a/debian/rules b/debian/rules
index a5780827..520ef948 100755
--- a/debian/rules
+++ b/debian/rules
@@ -285,6 +285,11 @@ ifneq (,$(filter $(DEB_HOST_ARCH),$(BOLT_ARCHS)))
     PROJECTS += ;bolt
 endif
 
+# flang is only for 64bits
+ifneq (,$(filter flang-$(LLVM_VERSION), $(shell dh_listpackages)))
+    PROJECTS += ;flang
+endif
+
 CODECOVERAGE=no
 ifneq (,$(filter codecoverage,$(DEB_BUILD_OPTIONS)))
 # enable the code coverage