diff --git a/dsl/common/src/main/kotlin/io/mockk/Matchers.kt b/dsl/common/src/main/kotlin/io/mockk/Matchers.kt
index c9666ee08..15b0a52ce 100644
--- a/dsl/common/src/main/kotlin/io/mockk/Matchers.kt
+++ b/dsl/common/src/main/kotlin/io/mockk/Matchers.kt
@@ -62,6 +62,7 @@ data class FunctionMatcher<in T : Any>(
             try {
                 matchingFunc(arg)
             } catch (a: AssertionError) {
+                println(a)
                 false
             }
         }