diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFlags.java b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFlags.java
index b2495f7c836..b3bc615726e 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFlags.java
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFlags.java
@@ -27,6 +27,10 @@ public class IrFlags extends Flags {
     public static final BooleanFlagField IS_STATIC = FlagField.booleanAfter(IS_EXTERNAL_FIELD);
     public static final BooleanFlagField IS_FAKE_OVERRIDE = FlagField.booleanAfter(IS_STATIC);
 
+    // Parameters
+
+    public static final BooleanFlagField IS_HIDDEN = FlagField.booleanAfter(IS_NOINLINE);
+
     // Local variables
     public static final BooleanFlagField IS_LOCAL_VAR = FlagField.booleanAfter(HAS_ANNOTATIONS);
     public static final BooleanFlagField IS_LOCAL_CONST = FlagField.booleanAfter(IS_LOCAL_VAR);
@@ -79,6 +83,21 @@ public class IrFlags extends Flags {
                 ;
     }
 
+    public static int getValueParameterFlags(
+            boolean hasAnnotations,
+            boolean declaresDefaultValue,
+            boolean isCrossinline,
+            boolean isNoinline,
+            boolean isHidden
+    ) {
+        return HAS_ANNOTATIONS.toFlags(hasAnnotations)
+               | DECLARES_DEFAULT_VALUE.toFlags(declaresDefaultValue)
+               | IS_CROSSINLINE.toFlags(isCrossinline)
+               | IS_NOINLINE.toFlags(isNoinline)
+               | IS_HIDDEN.toFlags(isHidden)
+                ;
+    }
+
     public static int getLocalFlags(boolean hasAnnotations, boolean isVar, boolean isConst, boolean isLateinit) {
         return HAS_ANNOTATIONS.toFlags(hasAnnotations)
                | IS_LOCAL_VAR.toFlags(isVar)
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/encodings/BinaryFlags.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/encodings/BinaryFlags.kt
index 827109d4da2..f73df2ac680 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/encodings/BinaryFlags.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/encodings/BinaryFlags.kt
@@ -142,11 +142,12 @@ inline class ValueParameterFlags(val flags: Long) {
 
     val isCrossInline: Boolean get() = IrFlags.IS_CROSSINLINE.get(flags.toInt())
     val isNoInline: Boolean get() = IrFlags.IS_NOINLINE.get(flags.toInt())
+    val isHidden: Boolean get() = IrFlags.IS_HIDDEN.get(flags.toInt())
 
     companion object {
         fun encode(param: IrValueParameter): Long {
             return param.run {
-                IrFlags.getValueParameterFlags(annotations.isNotEmpty(), defaultValue != null, isCrossinline, isNoinline).toLong()
+                IrFlags.getValueParameterFlags(annotations.isNotEmpty(), defaultValue != null, isCrossinline, isNoinline, isHidden).toLong()
             }
         }