diff --git a/src/test/scala/com/typesafe/scalalogging/LoggerTakingImplicitSpec.scala b/src/test/scala/com/typesafe/scalalogging/LoggerTakingImplicitSpec.scala
index 1ab3ecd..549468b 100644
--- a/src/test/scala/com/typesafe/scalalogging/LoggerTakingImplicitSpec.scala
+++ b/src/test/scala/com/typesafe/scalalogging/LoggerTakingImplicitSpec.scala
@@ -392,12 +392,12 @@ class LoggerTakingImplicitSpec extends AnyWordSpec with Matchers with Varargs wi
     val msg = "msg"
     val cause = new RuntimeException("cause")
     val arg1 = "arg1"
-    val arg2 = Integer.valueOf(1)
+    val arg2: Integer = Integer.valueOf(1)
     val arg3 = "arg3"
     val logMsg = "corrId - msg"
-    val underlying = mock[org.slf4j.Logger]
+    val underlying: Underlying = mock[org.slf4j.Logger]
     when(p(underlying)).thenReturn(isEnabled)
     if (stubCanLog) when(canLogCorrelationId.logMessage(any[String], any[CorrelationId])).thenReturn(logMsg)
-    val logger = Logger.takingImplicit[CorrelationId](underlying)
+    val logger: LoggerTakingImplicit[CorrelationId] = Logger.takingImplicit[CorrelationId](underlying)
   }
 }