diff --git a/misc/cgo/test/sigaltstack.go b/misc/cgo/test/sigaltstack.go
index 54faa2a489..787653c482 100644
--- a/misc/cgo/test/sigaltstack.go
+++ b/misc/cgo/test/sigaltstack.go
@@ -56,7 +56,7 @@ import (
 func testSigaltstack(t *testing.T) {
 	switch {
 	case runtime.GOOS == "solaris", runtime.GOOS == "darwin" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64"):
-		t.Skipf("switching signal stack not implemented on %s/s", runtime.GOOS, runtime.GOARCH)
+		t.Skipf("switching signal stack not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
 	}
 
 	C.changeSignalStack()