diff --git a/internal/configuration/sources/files/wireguard.go b/internal/configuration/sources/files/wireguard.go
index 5ed3a812..658cb895 100644
--- a/internal/configuration/sources/files/wireguard.go
+++ b/internal/configuration/sources/files/wireguard.go
@@ -101,6 +101,9 @@ func parseINIWireguardAddress(section *ini.Section) (
 	addresses = make([]netip.Prefix, len(addressStrings))
 	for i, addressString := range addressStrings {
 		addressString = strings.TrimSpace(addressString)
+		if !strings.ContainsRune(addressString, '/') {
+			addressString += "/32"
+		}
 		addresses[i], err = netip.ParsePrefix(addressString)
 		if err != nil {
 			return nil, fmt.Errorf("parsing address: %w", err)
diff --git a/internal/configuration/sources/files/wireguard_test.go b/internal/configuration/sources/files/wireguard_test.go
index c74aab43..a93102eb 100644
--- a/internal/configuration/sources/files/wireguard_test.go
+++ b/internal/configuration/sources/files/wireguard_test.go
@@ -131,7 +131,7 @@ PreSharedKey = x
 			iniData: `[Interface]
 Address = x
 `,
-			errMessage: "parsing address: netip.ParsePrefix(\"x\"): no '/'",
+			errMessage: "parsing address: netip.ParsePrefix(\"x/32\"): ParseAddr(\"x\"): unable to parse IP",
 		},
 		"success": {
 			iniData: `
@@ -238,7 +238,7 @@ func Test_parseINIWireguardAddress(t *testing.T) {
 		"bad address": {
 			fileContent: `[Interface]
 Address = x`,
-			errMessage: "parsing address: netip.ParsePrefix(\"x\"): no '/'",
+			errMessage: "parsing address: netip.ParsePrefix(\"x/32\"): ParseAddr(\"x\"): unable to parse IP",
 		},
 		"success": {
 			fileContent: `[Interface]