diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/SMAP.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/SMAP.kt
index 77dded0b185..cc02cb9bbca 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/SMAP.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/SMAP.kt
@@ -66,16 +66,10 @@ class SourceMapCopier(val parent: SourceMapper, private val smap: SMAP, val call
             return mappedLineNumber
         }
 
-        val newLineNumber = if (lineNumber == 65100) {
-            // TODO This is a compatibility hack for reading bytecode generated by 1.4-M1. Once the bootstrap
-            //   compiler is updated to a newer version, it can be removed (as newer bytecode explicitly lists
-            //   this range in the SMAP).
-            parent.mapSyntheticLineNumber(InlineOnlySmapSkipper.LOCAL_VARIABLE_INLINE_ARGUMENT_SYNTHETIC_LINE_NUMBER)
-        } else {
-            val range = lastVisitedRange?.takeIf { lineNumber in it } ?: smap.findRange(lineNumber) ?: return -1
-            lastVisitedRange = range
-            parent.mapLineNumber(range.mapDestToSource(lineNumber), callSite ?: range.callSite)
-        }
+        val range = lastVisitedRange?.takeIf { lineNumber in it } ?: smap.findRange(lineNumber) ?: return -1
+        lastVisitedRange = range
+        val newLineNumber = parent.mapLineNumber(range.mapDestToSource(lineNumber), callSite ?: range.callSite)
+
         visitedLines.put(lineNumber, newLineNumber)
         return newLineNumber
     }