diff --git a/src/cmd/compile/internal/gc/inl_test.go b/src/cmd/compile/internal/gc/inl_test.go
index 3fdbf1e4923..6c2b7299c2f 100644
--- a/src/cmd/compile/internal/gc/inl_test.go
+++ b/src/cmd/compile/internal/gc/inl_test.go
@@ -135,11 +135,14 @@ func TestIntendedInlining(t *testing.T) {
 		},
 	}
 
-	if runtime.GOARCH != "386" {
+	if runtime.GOARCH != "386" && runtime.GOARCH != "mips64" && runtime.GOARCH != "mips64le" {
 		// nextFreeFast calls sys.Ctz64, which on 386 is implemented in asm and is not inlinable.
 		// We currently don't have midstack inlining so nextFreeFast is also not inlinable on 386.
-		// So check for it only on non-386 platforms.
+		// On MIPS64x, Ctz64 is not intrinsified and causes nextFreeFast too expensive to inline
+		// (Issue 22239).
 		want["runtime"] = append(want["runtime"], "nextFreeFast")
+	}
+	if runtime.GOARCH != "386" {
 		// As explained above, Ctz64 and Ctz32 are not Go code on 386.
 		// The same applies to Bswap32.
 		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "Ctz64")