diff --git a/compiler/testData/diagnostics/tests/Infix.kt b/compiler/testData/diagnostics/tests/Infix.kt
index c519a9127a5..1ca06d751c4 100644
--- a/compiler/testData/diagnostics/tests/Infix.kt
+++ b/compiler/testData/diagnostics/tests/Infix.kt
@@ -8,11 +8,11 @@ class Example {
 infix fun Example.toExt(other: Example) = Pair(this, other)
 fun Example.toExtNonInfix(other: Example) = Pair(this, other)
 
-infix fun Example.toExtWithExtraParams(other: Example, blah: Int = 0) = Pair(this, other)
-fun Example.toExtNonInfixWithExtraParams(other: Example, blah: Int = 0) = Pair(this, other)
+infix fun Example.toExtWithExtraParams(other: Example, <!UNUSED_PARAMETER!>blah<!>: Int = 0) = Pair(this, other)
+fun Example.toExtNonInfixWithExtraParams(other: Example, <!UNUSED_PARAMETER!>blah<!>: Int = 0) = Pair(this, other)
 
-infix fun Example.toExtDefaultValues(other: Example? = null, blah: Int = 0) = Pair(this, other)
-fun Example.toExtNonInfixDefaultValues(other: Example? = null, blah: Int = 0) = Pair(this, other)
+infix fun Example.toExtDefaultValues(other: Example? = null, <!UNUSED_PARAMETER!>blah<!>: Int = 0) = Pair(this, other)
+fun Example.toExtNonInfixDefaultValues(other: Example? = null, <!UNUSED_PARAMETER!>blah<!>: Int = 0) = Pair(this, other)
 
 fun Example.withLambda(f: () -> Unit) = Pair(this, f)
 
diff --git a/compiler/testData/diagnostics/tests/Infix.txt b/compiler/testData/diagnostics/tests/Infix.txt
index 2f94f1a15d7..fdac755b1f3 100644
--- a/compiler/testData/diagnostics/tests/Infix.txt
+++ b/compiler/testData/diagnostics/tests/Infix.txt
@@ -2,7 +2,11 @@ package
 
 public fun test(): kotlin.Unit
 public infix fun Example.toExt(/*0*/ other: Example): Pair<Example, Example>
+public infix fun Example.toExtDefaultValues(/*0*/ other: Example? = ..., /*1*/ blah: kotlin.Int = ...): Pair<Example, Example?>
 public fun Example.toExtNonInfix(/*0*/ other: Example): Pair<Example, Example>
+public fun Example.toExtNonInfixDefaultValues(/*0*/ other: Example? = ..., /*1*/ blah: kotlin.Int = ...): Pair<Example, Example?>
+public fun Example.toExtNonInfixWithExtraParams(/*0*/ other: Example, /*1*/ blah: kotlin.Int = ...): Pair<Example, Example>
+public infix fun Example.toExtWithExtraParams(/*0*/ other: Example, /*1*/ blah: kotlin.Int = ...): Pair<Example, Example>
 public fun Example.withLambda(/*0*/ f: () -> kotlin.Unit): Pair<Example, () -> kotlin.Unit>
 
 public final class Example {
diff --git a/compiler/testData/diagnostics/tests/InfixModifierApplicability.txt b/compiler/testData/diagnostics/tests/InfixModifierApplicability.txt
index a95acbacce6..4c73a55a4b6 100644
--- a/compiler/testData/diagnostics/tests/InfixModifierApplicability.txt
+++ b/compiler/testData/diagnostics/tests/InfixModifierApplicability.txt
@@ -5,6 +5,7 @@ public infix fun w2(/*0*/ s: kotlin.String): kotlin.Unit
 public infix fun w5(/*0*/ a: kotlin.Int, /*1*/ b: kotlin.Int): kotlin.Unit
 public infix fun kotlin.String.o1(/*0*/ o: kotlin.String): kotlin.String
 public infix fun kotlin.String.o2(/*0*/ o: kotlin.String, /*1*/ o2: kotlin.String? = ...): kotlin.String
+public infix fun kotlin.String.o3(/*0*/ o: kotlin.String = ..., /*1*/ o2: kotlin.String? = ...): kotlin.String
 public infix fun </*0*/ A, /*1*/ B> A.to(/*0*/ that: B): Pair<A, B>
 public infix fun kotlin.String.w3(): kotlin.Unit
 public infix fun kotlin.String.w4(/*0*/ a: kotlin.Int, /*1*/ b: kotlin.Int): kotlin.Unit