diff --git a/meta/lib/oe/sstatesig.py b/meta/lib/oe/sstatesig.py
index ae7ef14453f..f943df181e6 100644
--- a/meta/lib/oe/sstatesig.py
+++ b/meta/lib/oe/sstatesig.py
@@ -26,8 +26,6 @@ def sstate_rundepfilter(siggen, fn, recipename, task, dep, depname, dataCaches):
         return "/allarch.bbclass" in inherits
     def isImage(mc, fn):
         return "/image.bbclass" in " ".join(dataCaches[mc].inherits[fn])
-    def isSPDXTask(task):
-        return task in ("do_create_spdx", "do_create_runtime_spdx")
 
     depmc, _, deptaskname, depmcfn = bb.runqueue.split_tid_mcfn(dep)
     mc, _ = bb.runqueue.split_mc(fn)
@@ -38,13 +36,6 @@ def sstate_rundepfilter(siggen, fn, recipename, task, dep, depname, dataCaches):
     if task == "do_rm_work":
         return False
 
-    # Keep all dependencies between SPDX tasks in the signature. SPDX documents
-    # are linked together by hashes, which means if a dependent document changes,
-    # all downstream documents must be re-written (even if they are "safe"
-    # dependencies).
-    if isSPDXTask(task) and isSPDXTask(deptaskname):
-        return True
-
     # (Almost) always include our own inter-task dependencies (unless it comes
     # from a mcdepends). The exception is the special
     # do_kernel_configme->do_unpack_and_patch dependency from archiver.bbclass.