diff --git a/src/common/InputHandler.ts b/src/common/InputHandler.ts
index 7be2f1aa..76f77fdd 100644
--- a/src/common/InputHandler.ts
+++ b/src/common/InputHandler.ts
@@ -126,6 +126,10 @@ export class InputHandler extends Disposable implements IInputHandler {
   protected _windowTitleStack: string[] = [];
   protected _iconNameStack: string[] = [];
 
+  // Cached result of getJoinProperties(..., precedingCodepoint).
+  // Only valid if precedingCodepoint !== 0
+  public precedingJoinState: number = -1; // UnicodeJoinProperties
+
   private _curAttrData: IAttributeData = DEFAULT_ATTR_DATA.clone();
   public getAttrData(): IAttributeData { return this._curAttrData; }
   private _eraseAttrDataInternal: IAttributeData = DEFAULT_ATTR_DATA.clone();
@@ -177,7 +181,7 @@ export class InputHandler extends Disposable implements IInputHandler {
     private readonly _oscLinkService: IOscLinkService,
     private readonly _coreMouseService: ICoreMouseService,
     private readonly _unicodeService: IUnicodeService,
-    private readonly _parser: EscapeSequenceParser = new EscapeSequenceParser()
+    private readonly _parser: IEscapeSequenceParser = new EscapeSequenceParser()
   ) {
     super();
     this.register(this._parser);
@@ -518,7 +522,7 @@ export class InputHandler extends Disposable implements IInputHandler {
     }
 
     let precedingInfo = this._parser.precedingCodepoint === 0 ? 0
-      : this._parser.precedingJoinState;
+      : this.precedingJoinState;
     for (let pos = start; pos < end; ++pos) {
       code = data[pos];
 
@@ -632,7 +636,7 @@ export class InputHandler extends Disposable implements IInputHandler {
       }
     }
 
-    this._parser.precedingJoinState = precedingInfo;
+    this.precedingJoinState = precedingInfo;
     // store last char in Parser.precedingCodepoint for REP to work correctly
     // This needs to check whether:
     //  - combining: only base char gets carried on (bug in xterm?)
diff --git a/src/common/parser/EscapeSequenceParser.ts b/src/common/parser/EscapeSequenceParser.ts
index f8da3b38..2f3ddd92 100644
--- a/src/common/parser/EscapeSequenceParser.ts
+++ b/src/common/parser/EscapeSequenceParser.ts
@@ -231,9 +231,6 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
   public initialState: number;
   public currentState: number;
   public precedingCodepoint: number;
-  // Cached result of getJoinProperties(..., precedingCodepoint).
-  // Only valid if precedingCodepoint !== 0
-  public precedingJoinState: number = -1; // UnicodeJoinProperties
 
   // buffers over several parse calls
   protected _params: Params;