diff --git a/application/src/main/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractor.kt b/application/src/main/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractor.kt
index 0e0add3..800f8b7 100644
--- a/application/src/main/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractor.kt
+++ b/application/src/main/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractor.kt
@@ -12,7 +12,7 @@ object PskExtractor {
      * Group 1 containing the next 16 chars after PSK: this is only the key
      * Group 2 containing the next 64 chars after the key this is only the hash
      */
-    private val pskKeyHashSplitterRegex = "!PSK:([a-zA-Z0-9]{16})([a-zA-Z0-9]{64});PSK:[a-zA-Z0-9]{16}[a-zA-Z0-9]{64}SET".toRegex()
+    private val pskKeyHashSplitterRegex = "!PSK:([a-zA-Z0-9]{16}):([a-zA-Z0-9]{64});PSK:[a-zA-Z0-9]{16}:[a-zA-Z0-9]{64}SET".toRegex()
 
     fun hasPskCommand(command: String) = pskKeyHashSplitterRegex.matches(command)
 
diff --git a/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractorTest.kt b/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractorTest.kt
index efa148f..4d27b73 100644
--- a/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractorTest.kt
+++ b/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/PskExtractorTest.kt
@@ -13,9 +13,9 @@ class PskExtractorTest {
     companion object {
         private const val testHash = "1234567890123456123456789012345612345678901234561234567890123456"
 
-        private const val validPskCommand = "!PSK:1234567891234567${testHash};PSK:1234567891234567${testHash}SET"
-        private const val validPskCommandWithKeyWordsInKey = "!PSK:PSKaSET1PSKd2SET${testHash};PSK:PSKaSET1PSKd2SET${testHash}SET"
-        private const val invalidKeySizePskCommand = "!PSK:1234${testHash};PSK:1234${testHash}SET"
+        private const val validPskCommand = "!PSK:1234567891234567:${testHash};PSK:1234567891234567:${testHash}SET"
+        private const val validPskCommandWithKeyWordsInKey = "!PSK:PSKaSET1PSKd2SET:${testHash};PSK:PSKaSET1PSKd2SET:${testHash}SET"
+        private const val invalidKeySizePskCommand = "!PSK:1234:${testHash};PSK:1234:${testHash}SET"
         private const val notPskCommand = "NoPskCommandInThisString"
     }
 
diff --git a/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/command/PskCommandHandlerTest.kt b/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/command/PskCommandHandlerTest.kt
index 5a6ce47..f910053 100644
--- a/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/command/PskCommandHandlerTest.kt
+++ b/application/src/test/kotlin/org/gxf/crestdevicesimulator/simulator/response/command/PskCommandHandlerTest.kt
@@ -54,7 +54,7 @@ class PskCommandHandlerTest {
     @Test
     fun shouldSetNewPskInStoreWhenTheKeyIsValid() {
         val expectedHash = DigestUtils.sha256Hex("$secret$newKey")
-        val pskCommand = "!PSK:$newKey$expectedHash;PSK:$newKey${expectedHash}SET"
+        val pskCommand = "!PSK:$newKey:$expectedHash;PSK:$newKey:${expectedHash}SET"
 
         pskCommandHandler.handlePskChange(pskCommand)
 
@@ -64,7 +64,7 @@ class PskCommandHandlerTest {
     @Test
     fun shouldThrowErrorWhenHashDoesNotMatch() {
         val invalidHash = DigestUtils.sha256Hex("invalid")
-        val pskCommand = "!PSK:$oldKey$invalidHash;PSK:$oldKey${invalidHash}SET"
+        val pskCommand = "!PSK:$oldKey:$invalidHash;PSK:$oldKey:${invalidHash}SET"
 
         val thrownException = catchException {
             pskCommandHandler.handlePskChange(pskCommand)