diff --git a/src/cmd/compile/internal/base/flag.go b/src/cmd/compile/internal/base/flag.go
index 942659bcc0..241f5da185 100644
--- a/src/cmd/compile/internal/base/flag.go
+++ b/src/cmd/compile/internal/base/flag.go
@@ -357,7 +357,7 @@ func concurrentBackendAllowed() bool {
 		return false
 	}
 	// TODO: fix races and enable the following flags
-	if Ctxt.Flag_shared || Ctxt.Flag_dynlink || Flag.Race {
+	if Ctxt.Flag_dynlink || Flag.Race {
 		return false
 	}
 	return true
diff --git a/src/cmd/go/internal/work/gc.go b/src/cmd/go/internal/work/gc.go
index 414736cbd7..85f661bf31 100644
--- a/src/cmd/go/internal/work/gc.go
+++ b/src/cmd/go/internal/work/gc.go
@@ -234,7 +234,7 @@ CheckFlags:
 		// except for known commonly used flags.
 		// If the user knows better, they can manually add their own -c to the gcflags.
 		switch flag {
-		case "-N", "-l", "-S", "-B", "-C", "-I":
+		case "-N", "-l", "-S", "-B", "-C", "-I", "-shared":
 			// OK
 		default:
 			canDashC = false