diff --git a/src/net/netip/netip.go b/src/net/netip/netip.go
index eae9c29ea71..bb83371a557 100644
--- a/src/net/netip/netip.go
+++ b/src/net/netip/netip.go
@@ -1310,14 +1310,14 @@ func ParsePrefix(s string) (Prefix, error) {
 	bitsStr := s[i+1:]
 	bits, err := strconv.Atoi(bitsStr)
 	if err != nil {
-		return Prefix{}, errors.New("netip.ParsePrefix(" + strconv.Quote(s) + ": bad bits after slash: " + strconv.Quote(bitsStr))
+		return Prefix{}, errors.New("netip.ParsePrefix(" + strconv.Quote(s) + "): bad bits after slash: " + strconv.Quote(bitsStr))
 	}
 	maxBits := 32
 	if ip.Is6() {
 		maxBits = 128
 	}
 	if bits < 0 || bits > maxBits {
-		return Prefix{}, errors.New("netip.ParsePrefix(" + strconv.Quote(s) + ": prefix length out of range")
+		return Prefix{}, errors.New("netip.ParsePrefix(" + strconv.Quote(s) + "): prefix length out of range")
 	}
 	return PrefixFrom(ip, bits), nil
 }