diff --git a/lib/internal/repl/completion.js b/lib/internal/repl/completion.js
index a16b7af0d1732c..59718ce57a5565 100644
--- a/lib/internal/repl/completion.js
+++ b/lib/internal/repl/completion.js
@@ -540,14 +540,14 @@ function findExpressionCompleteTarget(code) {
       // such code can't generate a valid AST so we need to strip
       // the suffix, run this function's logic and add back the
       // optional chaining operator to the result if present
-      const result = findExpressionCompleteTarget(code.slice(0, -2));
+      const result = findExpressionCompleteTarget(StringPrototypeSlice(code, 0, -2));
       return !result ? result : `${result}?.`;
     }
 
     // The code ends with a dot, such code can't generate a valid AST
     // so we need to strip the suffix, run this function's logic and
     // add back the dot to the result if present
-    const result = findExpressionCompleteTarget(code.slice(0, -1));
+    const result = findExpressionCompleteTarget(StringPrototypeSlice(code, 0, -1));
     return !result ? result : `${result}.`;
   }
 
@@ -587,7 +587,7 @@ function findExpressionCompleteTarget(code) {
   // want to potentially complete on, so let's re-run the function's logic on that
   if (lastBodyStatement.type === 'ExpressionStatement' && lastBodyStatement.expression.right) {
     const exprRight = lastBodyStatement.expression.right;
-    const exprRightCode = code.slice(exprRight.start, exprRight.end);
+    const exprRightCode = StringPrototypeSlice(code, exprRight.start, exprRight.end);
     return findExpressionCompleteTarget(exprRightCode);
   }
 
@@ -599,7 +599,7 @@ function findExpressionCompleteTarget(code) {
       // If there is no initialization we can simply return
       return null;
     }
-    const lastDeclarationInitCode = code.slice(lastDeclarationInit.start, lastDeclarationInit.end);
+    const lastDeclarationInitCode = StringPrototypeSlice(code, lastDeclarationInit.start, lastDeclarationInit.end);
     return findExpressionCompleteTarget(lastDeclarationInitCode);
   }
 
@@ -609,7 +609,7 @@ function findExpressionCompleteTarget(code) {
       lastBodyStatement.expression.type === 'UnaryExpression' &&
       lastBodyStatement.expression.argument) {
     const argument = lastBodyStatement.expression.argument;
-    const argumentCode = code.slice(argument.start, argument.end);
+    const argumentCode = StringPrototypeSlice(code, argument.start, argument.end);
     return findExpressionCompleteTarget(argumentCode);
   }
 
@@ -619,7 +619,7 @@ function findExpressionCompleteTarget(code) {
       lastBodyStatement.expression.type === 'NewExpression' &&
       lastBodyStatement.expression.callee) {
     const callee = lastBodyStatement.expression.callee;
-    const calleeCode = code.slice(callee.start, callee.end);
+    const calleeCode = StringPrototypeSlice(code, callee.start, callee.end);
     return findExpressionCompleteTarget(calleeCode);
   }
 
@@ -641,7 +641,7 @@ function findExpressionCompleteTarget(code) {
   // If any of the above early returns haven't activated then it means that
   // the potential complete target is the full code (e.g. the code represents
   // a simple partial identifier, a member expression, etc...)
-  return code.slice(lastBodyStatement.start, lastBodyStatement.end);
+  return StringPrototypeSlice(code, lastBodyStatement.start, lastBodyStatement.end);
 }
 
 /**
@@ -667,7 +667,7 @@ function includesProxiesOrGetters(expr, exprStr, evalFn, ctx, callback) {
     // The object itself is a member expression, so we need to recurse (e.g. the expression is `obj.foo.bar`)
     return includesProxiesOrGetters(
       expr.object,
-      exprStr.slice(0, expr.object.end),
+      StringPrototypeSlice(exprStr, 0, expr.object.end),
       evalFn,
       ctx,
       (includes, lastEvaledObj) => {
@@ -748,7 +748,7 @@ function includesProxiesOrGetters(expr, exprStr, evalFn, ctx, callback) {
       //       Arguably this behavior should not be too surprising, but if it turns out that it is,
       //       then we can revisit this behavior and add logic to analyze the property expression
       //       and eval it only if we can confidently say that it can't have any side effects
-      `try { ${exprStr.slice(astProp.start, astProp.end)} } catch {} `,
+      `try { ${StringPrototypeSlice(exprStr, astProp.start, astProp.end)} } catch {} `,
       ctx,
       getREPLResourceName(),
       (err, evaledProp) => {