diff --git a/compiler/src/dotty/tools/dotc/typer/Checking.scala b/compiler/src/dotty/tools/dotc/typer/Checking.scala
index 74db0593cfc5..f3f7e511966f 100644
--- a/compiler/src/dotty/tools/dotc/typer/Checking.scala
+++ b/compiler/src/dotty/tools/dotc/typer/Checking.scala
@@ -440,6 +440,8 @@ object Checking {
     }
     if (sym.isValueClass && sym.is(Trait) && !sym.isRefinementClass)
       fail(CannotExtendAnyVal(sym))
+    if (sym.isConstructor && !sym.isPrimaryConstructor && sym.owner.is(Trait, butNot = JavaDefined))
+      fail("Traits cannot have secondary constructors " + sym.owner.flagsString)
     checkCombination(Final, Open)
     checkCombination(Sealed, Open)
     checkCombination(Final, Sealed)
diff --git a/tests/neg/i8186.scala b/tests/neg/i8186.scala
new file mode 100644
index 000000000000..4e1cf925e6c4
--- /dev/null
+++ b/tests/neg/i8186.scala
@@ -0,0 +1,9 @@
+trait Test1() {
+  def this(x: Int) = // error
+    this()
+}
+
+trait Test2(x: Int) {
+  def this() = // error
+    this(3)
+}