diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/channels/ECDHRendezvousChannel.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/channels/ECDHRendezvousChannel.kt
index e844143889..c1d6b1b70e 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/channels/ECDHRendezvousChannel.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/channels/ECDHRendezvousChannel.kt
@@ -46,11 +46,6 @@ class ECDHRendezvousChannel(override var transport: RendezvousTransport, theirPu
         private const val ALGORITHM_SPEC = "AES/GCM/NoPadding"
         private const val KEY_SPEC = "AES"
         private val TAG = LoggerTag(ECDHRendezvousChannel::class.java.simpleName, LoggerTag.RENDEZVOUS).value
-
-        // this is the same representation as for SAS but we delimit by dashes instead of spaces for readability
-        private fun getDecimalCodeRepresentation(byteArray: ByteArray): String {
-            return SASDefaultVerificationTransaction.getDecimalCodeRepresentation(byteArray).replace(" ", "-")
-        }
     }
 
     @JsonClass(generateAdapter = true)
@@ -114,7 +109,7 @@ class ECDHRendezvousChannel(override var transport: RendezvousTransport, theirPu
             aesKey = sas.generateShortCode(aesInfo, 32)
 
             val rawChecksum = sas.generateShortCode(aesInfo, 5)
-            return getDecimalCodeRepresentation(rawChecksum)
+            return SASDefaultVerificationTransaction.getDecimalCodeRepresentation(rawChecksum, separator = "-")
         }
     }
 
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/transports/SimpleHttpRendezvousTransport.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/transports/SimpleHttpRendezvousTransport.kt
index 7a5cbe5424..620b599e3d 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/transports/SimpleHttpRendezvousTransport.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/transports/SimpleHttpRendezvousTransport.kt
@@ -29,6 +29,7 @@ import org.matrix.android.sdk.api.rendezvous.model.SimpleHttpRendezvousTransport
 import timber.log.Timber
 import java.text.SimpleDateFormat
 import java.util.Date
+import java.util.Locale
 
 /**
  * Implementation of the Simple HTTP transport MSC3886: https://github.com/matrix-org/matrix-spec-proposals/pull/3886
@@ -87,7 +88,7 @@ class SimpleHttpRendezvousTransport(rendezvousUri: String?) : RendezvousTranspor
             val location = response.header("location") ?: throw RuntimeException("No rendezvous URI found in response")
 
             response.header("expires")?.let {
-                val format = SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz")
+                val format = SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US)
                 expiresAt = format.parse(it)
             }
 
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/SASDefaultVerificationTransaction.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/SASDefaultVerificationTransaction.kt
index b306288c5e..29b416bb82 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/SASDefaultVerificationTransaction.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/SASDefaultVerificationTransaction.kt
@@ -95,7 +95,7 @@ internal abstract class SASDefaultVerificationTransaction(
          * The three 4-digit numbers are displayed to the user either with dashes (or another appropriate separator) separating the three numbers,
          * or with the three numbers on separate lines.
          */
-        fun getDecimalCodeRepresentation(byteArray: ByteArray): String {
+        fun getDecimalCodeRepresentation(byteArray: ByteArray, separator: String = " "): String {
             val b0 = byteArray[0].toUnsignedInt() // need unsigned byte
             val b1 = byteArray[1].toUnsignedInt() // need unsigned byte
             val b2 = byteArray[2].toUnsignedInt() // need unsigned byte
@@ -107,7 +107,7 @@ internal abstract class SASDefaultVerificationTransaction(
             val second = ((b1 and 0x7).shl(10) or b2.shl(2) or b3.shr(6)) + 1000
             // ((B3 & 0x3f) << 7 | B4 >> 1) + 1000
             val third = ((b3 and 0x3f).shl(7) or b4.shr(1)) + 1000
-            return "$first $second $third"
+            return "$first$separator$second$separator$third"
         }
     }