diff --git a/Source/Core/DolphinQt/Config/Mapping/IOWindow.cpp b/Source/Core/DolphinQt/Config/Mapping/IOWindow.cpp
index 0a77ae20f2..c042ee862c 100644
--- a/Source/Core/DolphinQt/Config/Mapping/IOWindow.cpp
+++ b/Source/Core/DolphinQt/Config/Mapping/IOWindow.cpp
@@ -191,7 +191,6 @@ void ControlExpressionSyntaxHighlighter::highlightBlock(const QString&)
   // This doesn't need to be run for every "block", but it works.
   if (ciface::ExpressionParser::ParseStatus::Successful == tokenize_status)
   {
-    ciface::ExpressionParser::RemoveInertTokens(&tokens);
     const auto parse_status = ciface::ExpressionParser::ParseTokens(tokens);
 
     if (ciface::ExpressionParser::ParseStatus::Successful != parse_status.status)
diff --git a/Source/Core/InputCommon/ControlReference/ExpressionParser.cpp b/Source/Core/InputCommon/ControlReference/ExpressionParser.cpp
index f3cb5206af..00e3200989 100644
--- a/Source/Core/InputCommon/ControlReference/ExpressionParser.cpp
+++ b/Source/Core/InputCommon/ControlReference/ExpressionParser.cpp
@@ -671,6 +671,11 @@ ParseResult ParseResult::MakeErrorResult(Token token, std::string description)
   return result;
 }
 
+bool IsInertToken(const Token& tok)
+{
+  return tok.type == TOK_COMMENT || tok.type == TOK_WHITESPACE;
+}
+
 class Parser
 {
 public:
@@ -700,7 +705,12 @@ private:
     return tok;
   }
 
-  Token Peek() { return *m_it; }
+  Token Peek()
+  {
+    while (IsInertToken(*m_it))
+      ++m_it;
+    return *m_it;
+  }
 
   bool Expects(TokenType type)
   {
@@ -959,18 +969,9 @@ static ParseResult ParseComplexExpression(const std::string& str)
   if (tokenize_status != ParseStatus::Successful)
     return ParseResult::MakeErrorResult(Token(TOK_INVALID),
                                         Common::GetStringT("Tokenizing failed."));
-
-  RemoveInertTokens(&tokens);
   return ParseTokens(tokens);
 }
 
-void RemoveInertTokens(std::vector<Token>* tokens)
-{
-  std::erase_if(*tokens, [](const Token& tok) {
-    return tok.type == TOK_COMMENT || tok.type == TOK_WHITESPACE;
-  });
-}
-
 static std::unique_ptr<Expression> ParseBarewordExpression(const std::string& str)
 {
   ControlQualifier qualifier;
diff --git a/Source/Core/InputCommon/ControlReference/ExpressionParser.h b/Source/Core/InputCommon/ControlReference/ExpressionParser.h
index bc39762127..3cda231ae2 100644
--- a/Source/Core/InputCommon/ControlReference/ExpressionParser.h
+++ b/Source/Core/InputCommon/ControlReference/ExpressionParser.h
@@ -195,6 +195,5 @@ private:
 
 ParseResult ParseExpression(const std::string& expr);
 ParseResult ParseTokens(const std::vector<Token>& tokens);
-void RemoveInertTokens(std::vector<Token>* tokens);
 
 }  // namespace ciface::ExpressionParser