diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index c5c38d4b47..a612bfadec 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -2692,49 +2692,6 @@ func Entryvalue(ctxt *Link) int64 {
 	return s.Value
 }
 
-func undefsym(ctxt *Link, s *sym.Symbol) {
-	var r *sym.Reloc
-
-	for i := 0; i < len(s.R); i++ {
-		r = &s.R[i]
-		if r.Sym == nil { // happens for some external ARM relocs
-			continue
-		}
-		// TODO(mwhudson): the test of VisibilityHidden here probably doesn't make
-		// sense and should be removed when someone has thought about it properly.
-		if (r.Sym.Type == sym.Sxxx || r.Sym.Type == sym.SXREF) && !r.Sym.Attr.VisibilityHidden() {
-			Errorf(s, "undefined: %q", r.Sym.Name)
-		}
-		if !r.Sym.Attr.Reachable() && r.Type != objabi.R_WEAKADDROFF {
-			Errorf(s, "relocation target %q", r.Sym.Name)
-		}
-	}
-}
-
-func (ctxt *Link) undef() {
-	// undefsym performs checks (almost) identical to checks
-	// that report undefined relocations in relocsym.
-	// Both undefsym and relocsym can report same symbol as undefined,
-	// which results in error message duplication (see #10978).
-	//
-	// The undef is run after Arch.Asmb and could detect some
-	// programming errors there, but if object being linked is already
-	// failed with errors, it is better to avoid duplicated errors.
-	if nerrors > 0 {
-		return
-	}
-
-	for _, s := range ctxt.Textp {
-		undefsym(ctxt, s)
-	}
-	for _, s := range ctxt.datap {
-		undefsym(ctxt, s)
-	}
-	if nerrors > 0 {
-		errorexit()
-	}
-}
-
 func (ctxt *Link) callgraph() {
 	if !*FlagC {
 		return
diff --git a/src/cmd/link/internal/ld/main.go b/src/cmd/link/internal/ld/main.go
index 80be4d95be..7d3f25540d 100644
--- a/src/cmd/link/internal/ld/main.go
+++ b/src/cmd/link/internal/ld/main.go
@@ -343,8 +343,6 @@ func Main(arch *sys.Arch, theArch Arch) {
 	bench.Start("Munmap")
 	ctxt.Out.Close() // Close handles Munmapping if necessary.
 
-	bench.Start("undef")
-	ctxt.undef()
 	bench.Start("hostlink")
 	ctxt.hostlink()
 	if ctxt.Debugvlog != 0 {