diff --git a/meta/classes-global/insane.bbclass b/meta/classes-global/insane.bbclass
index 03ac06b102f..eeef43d00e2 100644
--- a/meta/classes-global/insane.bbclass
+++ b/meta/classes-global/insane.bbclass
@@ -1602,6 +1602,11 @@ python () {
     if prog.search(pn):
         oe.qa.handle_error("uppercase-pn", 'PN: %s is upper case, this can result in unexpected behavior.' % pn, d)
 
+    sourcedir = d.getVar("S")
+    workdir = d.getVar("WORKDIR")
+    if sourcedir == workdir:
+        bb.fatal("Using S = ${WORKDIR} is no longer supported")
+
     # Some people mistakenly use DEPENDS:${PN} instead of DEPENDS and wonder
     # why it doesn't work.
     if (d.getVar(d.expand('DEPENDS:${PN}'))):