diff --git a/CHANGELOG.md b/CHANGELOG.md
index a36c9a169..afb6e6dfb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ All notable changes to this project will be documented in this file.
 - AS1/2 switch detection
 - [#1766] AS3 - direct editation - namespaces on global level without leading colon
 - [#1763] AS3 - function with activation - param assignment is not a declaration
+- AS3 - insert debug instruction to mark register names even with activation
 
 ## [15.0.0] - 2021-11-29
 ### Added
diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/abc/avm2/parser/script/AVM2SourceGenerator.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/abc/avm2/parser/script/AVM2SourceGenerator.java
index 6294e8a96..5b94c9e12 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/abc/avm2/parser/script/AVM2SourceGenerator.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/abc/avm2/parser/script/AVM2SourceGenerator.java
@@ -2001,9 +2001,7 @@ public class AVM2SourceGenerator implements SourceGenerator {
                 }
             }
             for (int i = 1; i < registerNames.size(); i++) {
-                if (!needsActivation) {
-                    mbodyCode.add(i - 1, ins(AVM2Instructions.Debug, 1, str(registerNames.get(i)), i - 1, (int) registerLines.get(i)));
-                }
+                mbodyCode.add(i - 1, ins(AVM2Instructions.Debug, 1, str(registerNames.get(i)), i - 1, (int) registerLines.get(i)));
             }
             if (!subMethod) {
                 mbodyCode.add(0, new AVM2Instruction(0, AVM2Instructions.GetLocal0, null));